Undo is a emitter type quirk that Undos or reverses any effect done to the user whether its poision, cuts, mind control,ect. For example: if someone is attacked by a user that can pause quirks or do damage to someone, then the user of this quirk can later undo the damage or unpause their quirk. The user can undo any effect against himself or another person. This is at the cost of calories lost, so the user will have to eat more to retain calories and use their quirk, if not they risk starvation.
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