User can induce corruption in anything/everything, including natural forces, abstract/conceptual properties, people with pure hearts and souls, users of Purification, even things that are by their definitions are immune to or shouldn't even be able to be corrupted (such as the air or wind) would be affected, and etc. Due to the nature of the corruption/corruptive influence, all attempts at trying to purify the target would either fail or lead to an eternal stalemate.