The Corrupted are the worst of the worst in the minds of most. People affected by the event in such a way they they were destroyed but god reconstructed them as these mad beings which would resemble the classic mutants in most media (controlled by god, mad).
They are creatures created after death when God takes the souls of the departed and twists them together to make an intellegent creature of death, forced to wander Eden as a twisted, tortured mass of hate.
This evolution only happens after those touched by the God - however miniscule - dies. When that happens the creatures rise once more as the Corrupted. The more powerful the living soul, the more powerful the Corrupted. All these beings care about is death, destruction, and making their God happy.