Most people here dont look like to know the rules of the jjk universe rules like domain expansion is not easy getou for example has a special grade in técnic and energy but never had one domain
I think u should have him learn reversed curse technique, so that with the ability to heal himself, he'll be able to produce more blood. This would probably be a qualitative strength improvement, because the amount of blood he has in his body should be one of his techniques main weakness
Awesome bro cant wait for the next chapter shaping up to be one of the best jjk fics. Also I would look to take inspiration from Alucard in the helsing anime and unohanas bankai in bleach for techniques and domain expansion
