-----
We tried giving Pyuku a System Seed after that, to see if we could help him grow even stronger… However, he rejected it. His soul seemed incredibly large, because it was the fusion between fifty Slime Souls. He had a lot of untapped potential, and that snack ended making him even stronger.
Powerful souls that have already enough power cannot receive a System; they end up rejecting the seed naturally. As if their souls are protecting themselves from it… Maybe it thinks they're like a parasite or something? In a way it feels like one, but has no negative side effects, it simply helps someone grow faster and develop their latent potential fully.
For now, Alice absorbed the seed back and got the EXP points back too, it is a useful way to try if it works and I don't lose any EXP if it doesn't either.