Where can I read the original novel?

as he doesn't have as much mana as the "Dragon Heart", being practically "Angra Mainyu 'everyone's evil'" he should have a "Divine Core" so consequently he would have an immense amount of mana (Google translate)

and what is the strength level of the “First-class God” Realm of “Dragon Prince Yuan” compared to the others?

You know that Lucifer, Michael and Gabriel have the same level of strength in "DC Cosmology", right? Only losing to the presence and Lucifer is only "stronger" because he is the favorite and has "more" authority over the "Demiurge" Power. But other than that they have the same strength. So this chapter didn't make much sense. Although this is a story, right? And so it's not supposed to make sense, but I was a little worried about it.

You know that all the "Quincys" in Bleach have matter manipulation, right? So this ends up leaving his Shikai useless

Will he eat the fruits of the other Tree?

Sukuna is not called the king of curses in the literal sense, he is called the king of curses. Because he is the greatest "jujutsu" user that ever existed and jujutsu is a curse, understand? Witchcraft.

You know that Gojo's "UNLIMITED" is just spatial manipulation at the atomic level, right? And most high-level Mushoku Tensei characters have some Counter against spatial manipulation. Or they even have Space manipulation, so Gojo's "UNLIMITED" wouldn't be much help to him, not in the Mushoku Tensei universe.

you are using Lucifer from the series not the one from DC Comics

the Lucifer you are using is not the one from DC neither here nor in China

the angel amanadiel does not exist in DC

Some noble soul explain to me who Mc is

if you don't invent a way for the protagonist to learn to use the "Aether" he won't even reach Arthur's feet

Only I think that "Unlimited" and "Cursed energy" would be practically useless in the world of "The beginning after the end" because "Magic" and "Aether" are much more versatile because one allows the user to manipulate the concepts of nature (fire, water, earth, wind etc...) and the other allows to manipulate "Metaphysical" concepts (space, time, creation, destruction, destiny etc...)?

he could try using the "Seimei Kikan" technique

This is not my hypothesis or a guess, these are the author's own words.

Every demon lord and true hero that evolved by the voice of the world has an ultimate skill.

This is impossible as they don't have Ultimate Skills.

This is impossible as they don't have Ultimate Skills.

to match "True Demon Lords" and "True Heroes" being a "Saint" are you crazy?