I am always trying to give as many ideas and possible explanation of their mechanics, it is sort of respect to authors and their time, you write whole story, if I want to have a positive influence on it, I must make sure to give you less, no more work. Like, i thunk that if I give idea I have duty to also provide helpful example, so author can take inspiration from it, just like from other works of fiction. Do not fell pressured by my comments when I write in a way that seem to imply that some things are working in certain way, it may be true according to the wiki of book i am Talking about, but your world is yours when youbwrite about it, and only set of rules is yours, in your fanfic everything can work the way you want, i just need to work with assumptions as I donnot know what you will decide to do. I understand it is hard to write and you do not have to worry about it, just write to me if you have any doubts, not that i have doubts about your competences, but there are many cases when I admire people for being brave to wirte and for sacrificing their time to do it, but I find it out that they started to write before reading to. Relations and writting style is something i can help in only by giving examples of good styles, but if it comes to mechanics i am some sort of expert, i mean, i seen it too many tines when soneone writes and I clearly see that someone did not read enought becouse I see many common mistakes, or at least choices are ones that are far from optimal or technically correct, mainly just lacking mechanics. I read your story becouse you seemed to have experience and thus being able to dodge most of mistakes, and just lack of ideas is not even considered as one, we are not in renessance era, you can not know everything, so take your time to ask questions, take advices and think. I have some time, so basic hmm, directions to take to not make mistakes, i mean i do not know recipe for good story, but I know what things make it worse, and while you can still write excellent story while simplyfying and downgrading some parts of the story and making other good, it is more reasonable to improve overall quality and not depend on expecting that other parts will be good enought to carry the story. Basically i know recipe for middle story, and it is up to author push their story beyond middle grade. You did no mistake so far, but you play in crossover and in world with game elements world, so it is rather dangerous situation. First, try to avoid phropercies, it is always a messy path, however, it does not mean no foresight, one of best types i found is based on soul six sense, from rather new novel "novel concept, death a day mc will live anyway" or something like that, where soul works as a perception organ, and throught touching elementary concepts and knowing all base data, it can predict possible outcomes. Baiscally soul have some sort of perception range or domain where it can sense everything and process that information, or you can just base on sensing and reading strings of fate or threads of time, everything but not prophercy. Speaking sincerly, you can even spoiler your own story and it would be ok, george Martin, author of game of thrones serie once said that he is killing his character becouse it gives realism, becouse in real world not everyone survives, so why main character should . Now look, people sometimes read books second or even more times, even if they know much more than if the mc survives to the end or not. Like entire plot. But the book is still good enought to read it. The main character of one of my favorite books, hmm, how to translate it "to make it before god" or in polish " Zdążyć przed Panem Bogiem" by Hanna Krall is the only survivor form Warsaw jews getto in WW2, only one from 60 thousand of people, and entire book is even written becouse he survived to talk about it. Reality defies martin idea i guess. For now you focus rather on story, not environment around characters in sense of syrrounding objects, and that is fine becouse it is happening in locations thst fans of this story know or can imagine as they saw the palace and have descriptions from other stories, but if you decide to be more descriptive at some point, you must be strict, about descriptions, i only made it to half of Tolkien two towers, second from lord of the ring series, before I decided i have enought of his descriptions, i heard that this man was able to go for a 30 minute walk and stare on one tree leaf for half of it and after reading i belive in those stories, But worry not, it is all about creating right mood, to give a hint what image your reader should imagine. Pointing one part of room,like many old weebs on roof would give image of old, dusty room, don not describe all walls, floor and equipement, how old or new they look, and if, only to make the image harder if need, the more items you describe in certain way, the stronger the feeling and image. One can write entire book, like patrick rothfous with his music of silent world with only decription and inner monologue of only one character, it just need to be dynaminc enought. An excuse to theory that i just dont like description and threw Tolkien becouse of it, I just dont like all descritpions, becouse many are pointless, it is like yes, I see old, dusty room, i know what is inside and how it looks, and if I already see it while ther is still half or even more discription left that provide no improvement to my already crated image, then rest of this description is like standing in this room or in door and just staring with empty mind like if i am stunned or unable to focus and think about something else or about any constructive clues about said room, about what happened here or what I have to do here or if I actualy have something to do here. Just very stupid feeling in real life, and very irritating while reading becouse someone, author, is doing it to you, on purpose, many times. Do not ever forget descritpions during dialogues, thoughts and expressions, you did good job until now but it is better to be sure and remeber. And wolrdbuilding, do not base on narnia or lord of the ring or hobbit, they are poor, films are good but books are so poor i will eternally repect filmmakers and scenario writers becouse for example the battles in narnia and battle of five armis in hobbit were just... absent, you must write in such way that reader would imagine in his mind what they saw while watching a movie, and Tolkien failed to do so. Unlike eragon, while reading inheritance cycle i saw in my mind exactly something on a scale of middle earth Tolkien battles that fillmmakers manage to bring us, But I am Talking about the books, unlike Tolkien and narnia case, film is much worse than book, fans basically agree tł never oficjalny admit that there is a movie adaptation of eragon, unless for greater good of giving it as example of how book should not be adapted. Like it is not even so terrible but compared to book it is a shame both as movie itself and as an adaptation. And to most important part in your story, the magic and world mechanic. It often does not feel that way becouse of many book that were succesfull beside lacking in that area, like witcher, harry potter, lord of the rings, narnia, and so it goes, but like I said at the start, they compensatw it by being good in other areas, but hear me out, 7, 8 books of harry potter, and we dont know shit about how magic works, No wand and chant is needed to cast magic if you are good enought, so how do they learn these spells, if certain wand moves and words are not causing magic, It is one of best exercises as writer and reader, to find explanations where they lack, creating powor system mechanics in such a way that that they will fit to world mechanics, story will still make sense, according to lore, and generally worldbuilding, for expample my current theory for harry potter mechanic is that either mana or soul, and now or becouse we do not know if there is mana as energy, but we know there is magic, so magic in the air thar fiendfire can feast on, so it may as well be a sort of self sustaining force field, remaing after usage of one generated by soul of living being that allows them to manipulate or at least influence reality to certain extent. In such case, we can see soul, or mana if it exist, as we see brain, our Brain remebers everything we experinece, until it is damaged, for example by aging or brute force. In wchich case, every wizard automatically remeber all spells that were ever remebered by any other mana, magic or soul they went in contact with throught they mana or lets call give influenting force field a name, a soul field, and thus every said said thing touched before, and so it goes spreading like plague. And it works just like a memory, you technically remeber it, but first you need to recall it for actual use, and knowing how to jump is not exactly being able to, and is really a matter of your subconscious, you do not manualny manage all Micro muscle movement and tension in your leg, especially foot and ankle, that is needed to mantain balance while standing not even Talking about more complicated actions, Basically, every time some mc in other novels takes direct control over skeleton or golem body as marionette, well, they would crumble like bag of stones threw at floor, or being in overlord theme, like doll who strings has been cut. Ah, and remeber of constantly analyzed information about your body muscles tension and generally position, processed by your Brain at every moment. There was a guy who once lost that ability, but he managed to learn to move again, by seeing his own body, Brain learned to process it throught his eyes, but guess what, he was unable to move in the dark, even better, he vas unable to maintain muscle tension and position of his body when he was not seein it, if he was standing and you turned off the light, he fell instantly, real medical case by the way. So, they learn magic from they parents the day they were born, but they learn to recall it by seeing it and to use it by exercises and repeated action, basically by tricking their mind and self hypnosis. Like wand, while it helps in learning, makes use of magic harder, as more consciousa than unconscious, like helping baby walking by using a stick, but then baby grows up and do not know how to run, or does it worse that someone who learned it by himself becouse as adult he still runs and walks with that stick. Uff, my poor thumbs, anyway, back to descriptions and dialogues, god example is reincanated as a slime, it is good exaple of one of hmm, teporary peak novel, like, sort of novel with writting style i used to see as peak back when my taste was less refined and now i see that it lacks in description in many fragments, but is sitll enjoy mechanics, ideas, action, and worldbuilding. Anyway, magic mechanic in novels overall, it is always better to make it layered, like, the more layers you will put between cause and effect, the more you will be able to bend it when neede and still make it look like it was planned form wery start, You must make it feel like your character is discovering already existing mechanics, or better, new means, use and function of already existing one, make it feel that they were always here working te way they work, Do not just put new ones when you dont know what to do or how tonexpain smething, hoping they will collide with some other mechanic you dont remeber, reader need to fell that something is revealed, not invented on your knee (but even if you will do it is it is called improvisation and having light feather or pen, it is good if it is good, just hide it good enoughrznif reader can not notice it then it never existed) but being a part of greater plan and image. That is also why I hate propherices, you do not know how to make a motive for your character and push story further, just leave it to fate you can do whathever you want with it as author, but as I said it is mistake, as it is clearly visible and breaks immersion. The same way is unexplained magic system and world mechanic, you must create some, make rules, retrictions, and possibilities, create many layers to work with and invent new ways, do not put unexplained magic that works becouse it is magic where you dont know what to do. You have adventage beocuse you are writting fanfic and crossover, and mc who lacks memeories and knowledge of his powers that can be anything becouse crossover, so you can actually make that trick and make it natural. Basically, you need to make things feel mysterious instead of just lacking in infornation and knowledge, Best examples of such writting are assasin disciple and sword of truth, it is clear that prophercies and fate pushs the story and author writes magic on knww when needed, as well as new rules and prophercies, i readed it to the end, with all other continuatuon cycles in case of assasin, but reading it second time, maybe 30 years later 40. After forgetting everything and for the sake of melancholy. But you can do so like in enheritance cycle, i know that first book was writed without next ones planned in detail, as well as ilundetailed magic and wordbuilding, but it is only so obvious becouse I know circumstances of writer, he, or she, was 17, maybe 16 years old while starting to write it, propably without exlecting succes, and so we see how author takes it seriously while writting next book, but it was so natural, fells like if first nook was just introduction, a prologue, and next books make it feel like lack of knoledge and information about how anything works was intended, as next books provide exolaination of lack of expalinations and knowledge in first one, if it was writted for example by Brandon Sanderson, no one wluld have guessed it was not intended, and only author age and this book being iis first gives hints. What exactly are layers i am Talking about, well, it is, as I said, layer, a step that separates cause and effect, basically every mechanic is a layer, the more you have, the more you can bend them if needed, becouse you have more to work with the disadventage that you have more to work with, and thus more work. For exaple, magic, in harry potrer, there is no layer, there is just magic you work with and a prophercy , and Rowling can put anything out of nowhere, but she did not complicate system so she was able to focus on story that compensated for it enought beside of lack of explanation and presence of propehercy thst powers whole plot, becouse plot was decent even with prophercy. So lets try to make layer in magic and power system, you have soul, you have mind, lets divide to more layers, conscious, unconscious, willpower, then mana, emotions, soul power, vitality, and spiritual power of many forms Now lets narrow it down beocuse you decided to use only mana instead of cursed enrgy, what is rather good option, becouse you can make one oenry as much versatile as you want In difderent words mana is different things, it is mindpower or will and focus in the new world by monsoon, sort of life force, a radiation of soul and so it goes. form what I know until now, all Arthur skills may not be crossover skills but actually his skills, as orginal Artoria and thus Artur from fate possesed invisible air skill that resemples sukuna technikque, and instinct skill that resembles ultra instinct and even have smillar description or even the same, and there is evolution of it so to ex rank that may look like ultra instinct just becouse Arthur visualise it this way, or naturalny looks white for the version of Arthur that mc became. Demon lord haki can be explained just as his magical energy presence pressure, becouse well, it is described that mana is breath of planet itself and his dragon core can produce as much of magical enrgy as planet since it was said to go in pair with planet core heat. So well, all his powers can be explained as Artur powers, even domain can be explained as magic from fate, maybe 6th one or something, there is many magic here, or even magecraft, becoue he in some way understands what he is doing from explaination of his power from other words, so it is not more of miracle that any other action that utilizes mana. As he is from a word that lacked supernatural abilities. Then you have type moon fate wiki for it. But if they are type of crossover abilities that he get becouse they are compatybile with Arthur, and now his magic power apparently can replace cursed energy from jjk, becouse sukuna powers, and magicules from tensura becouse of demon lord haki. Now if that is right, then his mana and lets call mana his enrgy, the one he and his core create, and throw under that name magic enrgy, Gu and mana, Whatever, it is now one, versatile enrgy that can replace all other like said cuserd enrgy or magicules, and it is needed to call it mana instead of magic energy, becouse in fate magic energy does nature interferance, what means that is contacting magic fundation of world, and that implies that he should be limited to new world magic, skills and martial arts, or you just can explain that needed fundamental transmigrated with him like with players, or it was some greater power that caoused his transmigration, like in theory that Players used overvhelming of 5 elements world item to make magic works but that therory is stupid becouse world items should not works without yggdrassil laws either. Anyway, to make mana versatile it would be good to make it soul energy, lets say producted by soul, there is a problem of dragon core that was producing magic energy by itslef by unknown means but lets say that now it is just sort of mana or spiritual or soul construct that interferes or interacts with soul and thus can produce mana like soul. The you can even work with magic fundation of world like form fate, following my theory from previous comment that soul can act like world on its own, so soul can replace fundation, or needed laws and fundation are in his soul, whatever, soul is programing mana, or mana have is own program that makes it work in any way needed to power any abilities. Simple. Thus is a good, simple layer, but that gives you materials to work with, you can work with all abilities you want becouse crossover, you can work with mechanics of soul, mana and dragon core, and mana regenration, or just bend it all to fate mechaics if you want. Ah about soul and mind, it is better to make mind something bound with soul rather than body becouse many beings do not have one, and ways of producing and nature of mana, to be conpatybile with as many universes to crossover, must rely only on soul itself, not on interfernce of mind an mana, or life enrgy and mana, genrally soul can be alone, without mind, life force or something, it is source of mana, and vitality if you want to add said enrgy. Novel stubborn skill grinder in time loop for exaple went with that way and it works very nice. It is mainly becouse in may universes soul can be alone and still priduce enrgy, so it must be independent to be compatybile if you do not want tonintroduce may set of world rules. Well, you can, soemtimes it is impossible o avoid havibg many laws, rules and mechanics for different words, they are different after all and you can base on smilliarites only to certain extent, at some post i guess it will be eqsier to introduce power system already constructed by another writer, but try to avoid it, for example there is legion of novels and books with magic and mana, all working in smillar but different way that can not be put in one bag, so you must use versatile mana and vitality in your own power system to use them anyway, other way you can not have them all and still call it simple and short mana and magic without your writting and power set being so chaotic it will be unbearable for you and your readers . Ah yes stats, i do not know if you want to introduce them but there are types of stats and mixing them is often a mistake, not even in worldbuilding but in world mechanic itself. There is descriptive type, stats are description of ones power and that is it, it does not come from any source of reality manipulation, soul or mana influence. Going to the point, descriptive types are hard to improve and wirte story with, becouse at some point it lacks reasonabke explaination, especiallybwhen they gonhigher. Then, stats working directly and indirectly on users body, and now we came back to layers, becouse it is easy to mistake. First, it is hard to write and explaint direct stats, becouse there are limits of human body no matter what you do with it before physics kick in, for example, air resistance just fucks you at some point, turning to at certain speed and strengt to have resistance equal to solid stone for normal human. And human body biochemistry is hard to explain, just like hitting water, whenbsomething falls from 300 meters and hits water, it is as good as hitting concrete, and you are equally dead, nobidy would even see a difference if not ebcouse of the fact that water is wet, if they would dry you, no one knows itnwas water and not concrete. It is better to have stats that come from soul, where stats are form of reality manipulation, Now it is important to see difference with stats description becouse of psychics, when you have strenght stat that makes muscle stronger and agility that makes you move faster, that is the same stat or one of them is reality manipulation instead of bidy enchancement. Force comes from weight and speed, so if your weight is the same, havimg stronger muscles from strenght makes your moves faster, and moving your arm faster from agility means that it will hit with more force. So either body, where there is no agility, but for exaple dextrity that enchances relfexes, or you go to soul relity manipulation stats, it is also good becouse in this case stats can increase by the same value for all species, no matter how stronger they muscles are, avoiding situation where gorilla with strenght 100 have its punch power increased to be equal to 20 times of normal human but human only 3 times of normal human, becouse stat multiplies strenght of much more powerful Gorilla arms, Instead, like in systemic lands purgatory by author i do not remember, strenght stat just gives you ability to exert power like if you were stronger, or rather if you weighted more, but said additional weight is methapsychical, like from equation i mentioned, you have more weight, and if speed is same, the force is greater, so you move your arm with the same muscle lower and thus speed but it carry power like if thenarm was havier, resulting in more force Of course it also increases speed, becouse you can move your own bodybwith greater strenght, yii apply mkre force to movement and con push ground with more power, but rhw poon t is that your muscles ae not stronger in that system. I am trying to expalin ot that way beside my lacking english becouse it is not just ability to exert more power, becouse it would mean that just lightly toughing someone with strenght that would increase yiur own twice would be able to exert such power as your normal punch beside being normal touch, but it is not like that, like some kind of kinetic manipulation. No, it gives you more force to move, and becouse it works in one direction, newton laws does not fucknyou, you can have 1000 strneght and 10 constitution, becouse thrifld law states that ifnyoubapply force to an object, it applays equal and opposite force, and normally your hand or enture atm would not survive it, but applying force throught strenght star relaity manipulation, or mana if youn want it is up to you, works in one direction, lets say a certain power is applying this force, and said opposite force applyies to that power, not your hand. It is importanrz for exoalle strenght stat in the delve novel gives health and physical power, but fenensive power is not provided based on max health pool, but current one, meaning that when you lose healt you lose defense, what is pretry reaistuc, like, if your skin is cut and bruised it is easier to fuether damage it. But you have to remeber tohat abd always state if something is based on max pool and works with the same efficency no mater to how full the pool is, until it run down and js dpkated, or slowky loses its effect with amout loss It is also good to remeber about it while describing aura and pressure, is aura and pressure based on max energy pool and thus something like soul presence, its weight, or leaking energy, current enrgy, or on leaking enrgy but the leak or radiance is based on cureent amount of enrgy. Or is permament and thus itnis about max enrgy, Or leaks happen only when at full but regeneraton does not stop so overflow and leaks? Same goes for other stats, dextrity or some mental stats increase reflexes, time raction, or time dilatation or mental processing or whatever. Check the delve novel wiki, it had decent stat system, unique in certain way, good for inspiration, Now, to immunity, remember ainz psychical immunity high tier 3 ? Well, even 1 tier should give him immunity to psychics, meaning, he is immune to normal fire only magical one can damage him, even more, nuclear exolosion does nothing to him, unless it is magical, becouse that immunity stops kinetic force form affecting him, meaning that air pressure, prticle movement speed and vibration, and so, temeprature and psychical force of any levek, aven on laricle levek with elctromagnetic effects, and so, even radiation, does not work on him unless with certain amount of magic, if he wants to, he would have no friction while walking and no light touching him. That resolves problem of high speed fights where air becomes like stone, it just does not, becouse of imkunity and lack of friction form it, it does not affect. Same goes for any kind of physical resistance. About vitality, i do not accept Gu as it no matterwhat you say, vitality is something in new world as it is used to cast wild magic and is also wlated to soul, becouse to cast wold magic you need to sacriface souls, sonyeach, you certainly need some kind of vitality in place of hp, i know arthur is kinda strong with only psychical enchancement with mana, but it is certainly needed. Seriously speaking you can simplify it, just merge all stats inti vitality, max cap of vitality would represent psychical stats, strenght, regenration speed, dextrity, durability, endurance, constitution, lets say it is that soul force field manipulating reality, and vitality itslef is to heal vounds, a resurce for instant damage and stamina, or make stamina separate resuorce. But with instant damage recovery, it would function just right as HP. Just say that it reconstructs body basing on soul template or something, and is able to create or turn ot matter of body, again according to soul temeplate, ot will work just fine, something making things too complicated is too much work. Ah, and make sure to remember about stamina, either it should be recovered with body or be separate energy pool independent form psychical body, becouse if you gave tired arm, it is cut, and grows back throught vitality, then psychically it should be either in peak state without fatigue and weariness, or just new arm unable to move becouset it was just created andonkly arm regenrated without stamina of that body part. Seriously speaking you cannthrow cinstitutionstamina and wndurance this way, inremebr novel, etherious, where vitality stat evolves this way into dragon vitality and swallows constitution and stamina, just maing constitution equal to vitality, but unlike in the delve, it was based on max vitality, so it was not affected by current helath or vitality. So either stamina regenerates with body or is another energy pool or it does not make sense and sounds stupid, another common stat mistake. Just make vitality energy of the soul that like mana is verastike and can do anything, but unlika mana does only one thing, regenrates and maybe opposes debuffs, curses, negative status effects like tiredness, need to sleep, need of water and food and rest, becouse regenrates perfectly with full stamina and nutrients. And unlike mana, does it automatically. My advice for simple yet useful mental start is combinig unconsiunes with soul perception, processing and previous explained sight sense or foresight, so increasing mental stats just make your mind closer to soul capabilities, perception for soul sense, intelligence or clarity or vivity for mental processing and thinking speed or time dilatation, agility for increasing precision throught focus and increased reflex and reaction time, dextrity for increasing coordination by connesting with unconscious and soul, It is by my own idea, but I would reccommend it (shameless slef promotion) Falicity stat as sstat that increases connection with soul and unconscious, to increase ability to calculate and foresee speed and teajectory of objects movement without additional focus, basically ability to do it uncosciously,, just like dextrity does with uour own movement coreection. It is very important human trait, your conscious mind can calculate for weeks how and where younshould put your hand to catch something but you can correct your position and expected trajectory in real time, within 2 second, to catch it using nothing but automatic unconscious correction. Remeber of nutrients form vitality, and beside, he have avalon, he is immortal anyway. Ah and world omniscience, will, and foresight, in many novels universe knows future, as it knows about everything inside, but rember that in majy cases, and as far as I know in new world case too, it does not know everything, basjcally omniscience but stopped uy will and soul, imagine that you hooped some Wood, world knows it is Wood, and what can happen to him, including that it can be ser on fire and burn, but when you hoop it, befor it hallens, you already known that it is for fire. Congratulations, you know something world does not. Be alerted about body movenebt abd regenration, for exaple, in shapeshifter cases, body simply does not regenrate and change forms like in, for exaple, prototype, back light virus is magical, becouse chemical reactions thst move bidy simpky do nit work that fast, no mater how your body is constructed at molecular level. And runes, avoid making them just blines and curves, let them work like spells in harry pottrer, uh, inthink i had something not writted god enought to copy pastę it to translator. Here it goes, it is juat that after introduction you can not thake it back after doing it wrong the first time Runes basically rely on will, when you found a working rune, even in another universe, you could use it, you could learn to write the same one, at the moment of contact your magic and soul copied the entire rune and wrote it down, remembered it, its will and concept, or the will of the one who wrote it, now it is a matter of understanding this knowledge and extracting it correctly by shaping your own will and energy, Of course, in the universe from which this rune comes, knowing the shape is enough, this is because the will of the world itself will work, even without the will of the Rune master writing it, concepts work, spells work the same way, you saw and felt once and the magic copied it, now you have to make it repeat itself, the more you practice, the more fluent it becomes, and the more your magic knows what you mean and understands you, knowing how to execute the command, It's like the human brain, it remembers everything you have ever experienced and seen, but you can't extract these memories, but you know that all the faces you see in dreams you have really seen before, but you remember and recall only in the dream state. There are also runes that work on the basis of physics and the interaction of mana with mana or its elements, but this is simply a version where the concept of a given world and the will of its magic are used, because they are physics, and such frameworks are only partially effective, because they require not only the appropriate concepts in itself to manipulate magic, but also the appropriate magic and mana to respond appropriately to this manipulation, so it is susceptible to even slight disruptions, it is better to use Runes that use independent will and concepts, without relying on mana physics, but on bending mana to your will, unless someone forces a certain concept or will into mana or combines them with your mana or other energies. Smillar to how fate magecraft must interact with wird magic fundation or fundanentals or how it was called but you can theoritically have them in your mana or soul in your fanfic beocue its fanic and you can just copy poste rules of magic like that and explain however you want as author. Do not fell pressured by me putting so much effor in this comme, it is just amalgamation of my many previous comments and note, put togerher one corected in some points to apply in your situation, i an trying to help many newbie writers and this is sort of template, one that o should read again to find mistakes and finally change psychical to physical in many points but I have no motivation to do so. Also, about stats, I once noted some ideas, but they are written in my language not enlish and it was for me so I dont think that even chat gpt will be abke to translate it so it is too much effort to wirte itnwithout knowing if you want or dont want stats.

Form what I understand domain expension is basically reflecting your soul on the world using enrgy, and your mind is working as sort of perspective, so one soul can have many domain expension, just like every thing can look different depending on perspective, but still be the same thing, lets say your mind works as your own perspective and representation of your internal domain aka soul (in some interpretation soul i world itself as fragment of reality, or holds one, becouse soul realm) so you can reflect your soul on world basing on your will and understanding of your soul, i mean, you can have different looks of one thing, but you can imagine whole thing, and even its internal part, and understand its every function. Now lets say that your soul is making you yourself, a soul strong enought can generate enrgy and sustain mind on its own without need of material ir ny ither type of body or any kind of energy as sustainment, anchor, or whatever. then everything that is part of you have its influence and relfection on your soul, at least as form of information, memory image reflected on your soul, if not formation and shape of or in soul (look reincarnated as a slime, where skills are basically advenced patterns in soul, generally permament magic circles but in more advenced forms and made of soul) then every part of you is part of the image of your soul, and then EVERY PART OF YOU CAN BE REFLECTED ON WORLD AROUND YOU USING YOUR ENERGY or directly on your enrgy, and become a part of your domain, So he can make it that as long as he have understanding of any of his skills or attributes, and enought will and focus to maintain a clear image of it, he can extend a domain with its characteristic as long as he have enought enrgy, Domain with sukuna cutting abilities, domain with elements like sukuna fire basing on their understanding, domain with constant supression like demon lord haki, domain that overwhelm and overfolw with enrgy like his body and genrates enregy like dragon core, regeneration and defense domain becouse of avalon basically being merged with or atrsched to or residing inside his soul, maybe some dimensional barriers and healing in every doamin as passive effect of every domain becouse of any mechanic you will think of, for exaple throwing more enrgy in avalon would extend its powers, it makes sense as it haves dimensional ability to be able to work on distance, especially if he will have barrier domain, and even if not it would be logical to extend avalon powers to barrier to some extent making it more stable, and maybe impossible to be damaged from one or two sides or even making his domain a space cut off from reality. Even overwritting actual reality space with avalon space would make sense, its your fanfic man, go wild, you have free hand, i am proud to be here to throw ideas at you and see if they help you, It is rare to see as good wor as yours at such early stage, where one can actually help, becouse there are no like 100 useless comments 30 limited after chapter pops up so author have no motivation to read them.

Form what I understand domain expension is basically reflecting your soul on the world using enrgy, and your mind is working as sort of perspective, so one soul can have many domain expension, just like every thing can look different depending on perspective, but still be the same thing, lets say your mind works as your own perspective and representation of your internal domain aka soul (in some interpretation soul i world itself as fragment of reality, or holds one, becouse soul realm) so you can reflect your soul on world basing on your will and understanding of your soul, i mean, you can have different looks of one thing, but you can imagine whole thing, and even its internal part, and understand its every function. Now lets say that your soul is making you yourself, a soul strong enought can generate enrgy and sustain mind on its own without need of material ir ny ither type of body or any kind of energy as sustainment, anchor, or whatever. then everything that is part of you have its influence and relfection on your soul, at least as form of information, memory image reflected on your soul, if not formation and shape of or in soul (look reincarnated as a slime, where skills are basically advenced patterns in soul, generally permament magic circles but in more advenced forms and made of soul) then every part of you is part of the image of your soul, and then EVERY PART OF YOU CAN BE REFLECTED ON WORLD AROUND YOU USING YOUR ENERGY or directly on your enrgy, and become a part of your domain, So he can make it that as long as he have understanding of any of his skills or attributes, and enought will and focus to maintain a clear image of it, he can extend a domain with its characteristic as long as he have enought enrgy, Domain with sukuna cutting abilities, domain with elements like sukuna fire basing on their understanding, domain with constant supression like demon lord haki, domain that overwhelm and overfolw with enrgy like his body and genrates enregy like dragon core, regeneration and defense domain becouse of avalon basically being merged with or atrsched to or residing inside his soul, maybe some dimensional barriers and healing in every doamin as passive effect of every domain becouse of any mechanic you will think of, for exaple throwing more enrgy in avalon would extend its powers, it makes sense as it haves dimensional ability to be able to work on distance, especially if he will have barrier domain, and even if not it would be logical to extend avalon powers to barrier to some extent making it more stable, and maybe impossible to be damaged from one or two sides or even making his domain a space cut off from reality. Even overwritting actual reality space with avalon space would make sense, its your fanfic man, go wild, you have free hand, i am proud to be here to throw ideas at you and see if they help you, It is rare to see as good wor as yours at such early stage, where one can actually help, becouse there are no like 100 useless comments 30 limited after chapter pops up so author have no motivation to read them.

Well, in canon, after kai returned, he traveled across china and taken as ki from as much master as he have found, so kai would only be stronger than in canon at the start, his max power did not increase yet, and will not if tai lung will be face him before hai will strenghten. Beside, kai is still not strong enought to defeat oogway, and he will leave spirit learm as fast as he will defeat him, so, if played right way, tai lung will only have to face kai at his weakest state right after defeating oogway and retuning, before he take Chi of all masters that were still alive in china But conaidering that author seems to sugestie that he will be stronger than in canon, kai will be going around spirit realm until he gets ki of all masters, and only them going for oogway, and tai lund will end him more masters than kai orginally got after returning from spirit realm

I thing that it may be misunderstanding, that tai lung sudenly seem to act without thinking without plan and vuder lerspectige, but maybe he is, but we do not see it, becouse there is lack of inner thougts, making it seem like he is doing things without thinking beocuse his thoughts arennot written, i mean we know that he will control shen by force if he goes to far only becouse he said that so it feels as if he was not thinking about it before, being totally fine even if shen was going to start another genocide until now when he said he will not.

And before someone step up and say i am the morał one, who seestai lung as bad, it is just unrealistic for him to go on war, he didnt even kill masters who were wrong in attacking him, but now he want to go on war as if there will be no victims who did nothing wrong, maybe even author forgot, but at the start of this story tai lung tioughts were that he would be unable to kill 2 masters in one week, he values live, and suddenly he values his fame over live of thousands, maybe milion of lives, It is as he is not thinking properly, only trying to be nasty toward universe, i understand that he may want be fame and leave behind history of conquer, a warrior feared and respected by everyone for his strenght, becoue allarently universe is dancing to let him be known by good deeds. but he should know or at least find out in next chapters that such history will by created by spilling blood, by destroying farms, leading to hunger, death from starvation, palgues that always go in pair with wars, and he is jot doing it by any othr reason other that ones i pointed, Alliance woth shen is most stupid thing i ever heard, a war with entire china in name of revenge against one city, that cast him out for literall genocide, when the one responsibel is literały one old goeat that talk to much about future cousing problems and apparently wars and genocide in effect. Seriously, I know it is first pov and that is the only one thing that sves thi story beckus people can be horrible wrong form our point of view while being right form their own, but there are some boards how dense, self focused and cruel in effect you can make character to push te story until it feels unrelaistic as if he is not thinking at all beside his previous wisdom, intelligence and respect toward live.

I think that tai lung will at soem point sid down, meditate and understand that becoming Chi master and unlicking his second ki is about finding who he want to be, about not only accpeting himsel but also understanding, seeing flaws, changing to better verison of someone, wiser, not onky stronger, becouse if not before, at some point of this war he will understand that it was unnecessary, that war, that all he is going to leave behind him are bodies of innocent victims, that maybe he want to be himself, not a villian, but he became one unintentionally, that finally, he do not need anyone to acknoledge him, not for his strenght and how he uses it, but he himself is everyone that needs to see and remember who he is and acknowledge it, that real strengt lies in being independent form anyone atrention and opinion, even universe itself, so he do not need to do anything as he have nothing to prove to amyone.

about the second method of creating synthetic diamond, i think that you may choise this one becouse this method works with coal, i mean graphite praticles (graphite is very common type of pure coal, it is used in every pencil) and temperature without pressure, and vesuvius already have ability to direct control radioactive particles, so you just have to give him ability to control borum and coal particles, and synthetize them to diamond with mana and temperature It works like that: you have an smal diamond as a base, and this smal diamond is inside container with hight temerature, then you insert very hot graphite particles, they attach themselves to the diamond, but instead of being deposited on it as a layer of carbon or graphite, its structure changes to mimic that of a diamond, turning into a diamond on its surface and merging with it, thus making the diamond larger, and moreover, created artificial diamond is lighter than natural diamond, and up to two times harder, and as I mentioned earlier, if in this process, in addition to graphite particles, boron particles are included, the diamond will be blue, and it will conduct electricity Ah and about diamond processors, it is good too, you can make his whole armor to work as Computer, an microprocessor to form and cast magic spells, in addition to runes that you will propably put on that armor as well as on his scales, and the fact that one of his earlier evolutions includes possibility to contain ready magic spells in his runes it will works really well, no armor can be damged easily so it is may not be that good idea, but you can just turn his scales into diamond instead, one of their layers, the innermost, what means the savest and most protected one, may turn every single stale into an magic microprocessor made of diamond and runes,

Man, everything is perfect, keep going, and here is my advice, listen here, vesuvius have his treasures as a part of armor, or armor itself, and laterbthere will be more gens and diamond instead of only gold, and you must made it blue diamond and gems, becouse they conduct electricy, they contain boron elements concentration inside them, what made them blue, but also gives ability to naturally condict electricy, and they are doing it much more efficient than silicon or copper that is now used in micro processors and cables, vesuvius must have an blue diamond and gems armor that conduct electricy, it is even possible to grow and regenerate that armor naturally, becouse diamond is actually coal, diamond are make form coal under hight temperature and pressure, deep inside earth, and actually all lifeforms are based on coal, includes lizards, and dragons, well dragons are based on coal and mana, and it is what made vesuvius possible to do it, he heve temperature just make and organ iside him that replaces pressure with mana and you have diamond armor, well there is also one another method of creating synthetic diamond without pressure, but it is hard too desribe becouse English is not my first language, you must read about these methods of creating synthetic diamond by your own, i wish you will enjoy with reading and eventually writing about this, and I wish you a good day. Ah and diamond also are high resistant to hight temperature, even above 2000, and thy also conduct heat many times better than sikicon, or and copper or any other steel or nobel material than copper [img=recommend][img=update]