Forced to Become a Demonic Cultivator, I Can Waive the Price

After arriving in a world of immortal cultivation, Jiang Chen dreamed of becoming an immortal and joined a sect when it began recruiting disciples. Only after entering did he discover that it was a demonic sect. The techniques and spells used by demonic cultivators were powerful and quick to master, but they almost all came with side effects.

Just as Jiang Chen was falling into despair, his special ability appeared: by optimizing techniques and spells, it could eliminate their costs.

Jiang Chen took off from there. Whatever spell had the worst side effects, that was the one he practiced, because the worse the side effects, the more powerful the spell.