7 Hellish training Part 1/2

After putting down the barrier, I went over to a large boulder and prepared myself to use One For All because I know that using it will cause self harm, but I also know that event will only happen to people who have weak bodies.

My body is already strong, so I shouldn't get hurt too bad.

Taking my fist back I activated OFA and punched the boulder.

A/N: OFA = One For All

BOOOOOOOOOM!!!!!!

The boulder exploded into tiny pieces of rock. The punch was so strong that when the pieces of rock hit the boulders, they left a dent in them, but I wasn't good either. My entire arm was broken and I felt extreme pain coming from it.

AHHHHHHHHHHHHHHH!!!!!!! I screamed out of pain.

Luckily, my regeneration kicked in and healed my arm.

Even though this process only took 5 seconds, it felt like an hour to me.

Hah..... Hah... Hah... System, I knew that it would be painful, but what the hell? I already have a strong body, why did I still get hurt that badly?

[Because the host's body wasn't used to unleashing such power, the host's arm was severely wounded. However, the host's body will become accustomed to it over time, and the injuries will diminish gradually until you are able to utilize it without being injured]

Hah.... With time, huh? Oh well, this also happened to Midoriya, but mine is less severe since I already have a strong body.

Getting my bearings back, I went to another boulder and was about to try to use OFA again, but I remembered something important, so I asked.

"System can I use my 1 weapon mastery card on my zanpakutō?"

[Yes host, would you like to use it now?]

"Yes."

Then my surrounding's turned white and a figure with it's entire head covered in black light, wearing a black cloak appeared in front of me, holding a sword.

When I saw the figure, I immediately got alarmed and prepared to fight.

"Who are you!?" I shouted at the figure.

"Calm down, I'm here to help you master a weapon." The figure spoke with a male's voice.

"Huh? I don't just get it transferred into my brain?"

"Nope, you're gonna have to learn it old school and don't worry, no matter how long we are here, only 1 second will pass in the outside world." The figure assured me.

"Is this father-in-laws doing?"

"Yes."

"Okay, then let's get started." I said while taking out my zanpakutō to fight.

"Now that's the spirit." The figure said, before rushing at me with a speed that even I had a hard time reacting to.

"What tha-?!" I wasn't able to finish my words because he was already in front of me.

*Cling!*

Our swords collided but mine was easily overpowered, so I used sonído to appear by his side and slashed down vertically.

He only stepped to the side, then he slashed at me, but I used sonído again to dodge it and appeared behind him but he suddenly disappeared and a sword came form my back, trying to cut me diagonally.

When I sensed this I tried to use armament haki but it was too late, the sword almost cut me in half had I not used sonído to retreat.

"Are you cra-!" My words again got cut off again by a sword stabbing towards my chest, I parried it over my head and tried to stab him back but he hit my head with the hilt of his sword.

*Clank!* (sound of sword hitting the ground)

"Ow, ow, ow, damn it! That hurt!!! What are you doing?! Are you trying to kill me?!" I screamed at him, while still feeling the pain in both my head and back.

"No, if I really wanted to kill you, then you wouldn't even be able to react to it." He replied.

"Then why are you trying to cut me in half?!"

"When your in battle, your enemy won't show you any type of mercy."

"I thought I'm only here to master my swordsmanship." I asked confusedly.

"Of course you are, being merciless in battle is also part of mastering your swordsmanship, because if you show mercy in battle then you wouldn't be able to show your full potential in using a sword."

As much as I hate to say it, he was right.

"Fine, but at least give me a heads up on when you will be attacking me so that I will be ready." I said to him.

"Nope." Then I felt. I felt a strong wind from my side so I immediately used sonído to move out of the way.

"In this training session' I will teach you several things that are related to swordsmanship such as instinct, using your senses, sword intent and many more." He said, while barraging me with attacks.

I, who was being attacked is not in good condition, in a matter of seconds my body was riddled with wounds from light scratches to deep ones, but because of my regeneration it will heal after a few seconds.

Deflecting a sword strike from me, he said "Your regeneration is really an amazing skill, therefore were gonna abuse it and train your pain resistance first!" He said the last part while stabbing towards me.

I didn't have the time to talk back, because his attacks got more faster, stronger and more ruthless, every time he would attack me, he would aim for my vital points or organs.

-- 1 day later --

During my training, I decided to train my other abilities as well like my devil fruit, my armament and observation haki.

I didn't use OFA because that will cause me self harm and I'd rather not have have an extra injury than I should have.

My devil fruit powers increased tremendously, now I can teleport without feeling tired and I also made a new set of skills that I had in mind a long time ago.

They are space detonation, space deletion and space confinement.

Space detonation as the name says, allows me to detonate the space around my enemies making an explosion that will injure them.

Space deletion allows me to delete attacks by deleting the space around the attack erasing the attack as well.

This skill is very powerful because I can either choose to delete the space around the attack or I can use space deletion to delete the space in front of my enemy while he is preparing to attack, causing him to be exposed to the void and receive the backlash of his own attack, if there is any and there is a chance that he might die.

I can also use this to delete other things such as an object or my surroundings.

Space confinement allows me to lock the space around my enemy, immobilizing them.

I don't really know if these skills work on stronger opponents, because every time I would try to use it on William he would just beat me up more.

William is the one that is teaching me about swordsmanship. He said that we were practicing my swordsmanship and only that. I asked him, "Then what about my armament haki?"

"Armament haki allows you to coat your sword in haki, making it more powerful and sharper, strengthening your sword is also part of swordsmanship." Was he's reply.

As for my observation haki, It improved greatly during these few hours I can now sense around 23 meters around me.

My armament haki also didn't fall behind, now I can use it on any part of my body instantly without failing and it also took on a more darker color though you can hardly notice the change.

Training your haki in life and death battles really do help.

But what surprised me is that I've been training for hours now and experienced several life and death situations but I'm not collapsing nor am I feeling exhausted.

I was pulled back from my train of thoughts because of a sword heading towards my left eye.

I side stepped it and attempted to cut at his left rib but he only parried it and stabbed towards me.

I used sonído to quickly retreat, but he appeared in front of me, swinging his sword horizontally at my chest.

I instinctively covered my chest in armament haki, when the sword came into contact with my chest and a sound of metal colliding was heard.

*Cling!*

I got pushed back with a sword mark on my chest.

"Not bad you're instinct's have gotten more better and both your attacks and movements have also gotten more refined." He complimented me, who was getting up for another round.

"If you really mean it, then answer my question."

"What is it?"

"Why am I not getting tired despite all the training I've been doing?"

"That's because you are being given energy by the system."

"Now then, let's get back to training!" He said while attacking me.