A kid finds a broken system that lets him absorb the power of literally anything he kills, and instead of becoming a god, he becomes a problem, hunted, betrayed, forced to rebuild from nothing every time the world decides he's too dangerous. The power fantasy here isn't about winning; it's about surviving long enough to be worth saving. By episode 20 you stop asking if he'll get stronger and start asking if he'll stay human when the only currency that matters is the corpses behind him.
Wan Jie Zhizun is a action and adventure and fantasy ONA from Ruo Hong Culture.