
Tenko felt a shock through his left arm moments before getting physically punished by his father. Young Tenko's Quirk manifesting, resulting in the death of his entire family.ĭecay first manifested in five-year-old Tenko as he played with his dog, Mon.

ĭue to the fact that the user's Quirk Factor lies within their hands, more specifically their fingers, Tomura would lose the use of Decay if he lost them, similar to Overhaul. In addition, this Quirk is not effective if the user is wearing a pair of gloves. At this early point of Tomura's life, Decay's disintegration process was far weaker as it reduced affected targets down to chunks instead of dust.īecause the Quirk requires Tomura to touch a solid object in order to be activated, it is possible to counter Decay through Quirks that allow for the manipulation of fluids or particles, which Tomura cannot properly touch with his fingers. Tomura has had this ability ever since Decay first manifested on him, being strong enough to destroy an entire household, but due to his jumbled up memories of the event, he seemingly forgot about or mentally repressed this specific ability until halfway through the Revival Celebration, where flashes of his past started reminding him of what happened. It is also possible for the effect of Decay to spread beyond what the user has touched, creating a domino chain of disintegrated victims. The speed of the disintegration has developed from slow to almost immediate, eventually spreading through their whole body if a victim doesn't amputate the decaying body part ( Eraser Head was able to avoid this by erasing Decay before it could cause further damage to his flesh).

As such, this Quirk is extremely lethal against living beings, having their flesh rot away if hit by it. Whether the target is organic or not, Decay will work without fail. Tomura's disintegration spreading through a crowd of individuals. Much like is the case with Eri's Rewind, it is the result of a rare mutation that no one was aware of before it manifested.

Decay allows the user to destroy anything or anyone their hands touch, making it crumble to dust and powdered bone.
