The Corruption first appeared in the Random Nonsense Gathering. It's a chaotic force that has wavered from one extreme to another. The effects of the corruption enhances the user, boosting them to their Awakening Form with the drawback of being in a foggy mindset. Those who are under the effects are unable to see whether they can remember or understand, either stuttered and repeating themselves. They are confused ultimately confused.
Given that Corruption has spread out outside of the Random Nonsense Gathering timeline.
Note: There will be spoiler. Just not yet.