Decay

Decay (崩壊) is a Quirk used by Tomura Shigaraki.

Description
Decay allows Tomura to destroy anything his hands touch, making it crumble to dust.

Whether the target is organic or not, Decay will work without fail. As such, this Quirk is extremely lethal against living beings, having their flesh rot away if hit by it. The speed of the disintegration has varied from slow to almost immediate, and if a victim does not amputate the decaying body part, the Quirk's effects will eventually spread through their whole body, killing the target.

Decay will only occur when all five fingers touch the target. This indicates that the activation of the Quirk is not voluntary, or, at least, that Tomura has clumsy control over his own Quirk, so he must avoid using all his fingers to touch objects as a safeguard.

Because the Quirk requires all five fingers to touch an object in order to be activated, it is possible to counter Decay through Quirks that allow one to manipulate fluids or particles, which Tomura cannot properly touch with all his fingers.

Usage
Decay is Tomura's main method of combat. By nature, this Quirk forces Tomura to always engage his opponent in close quarters, however, he often requires only to make contact with his enemy in order to kill or, at least, heavily injure them.

Tomura is often careful with his hands when touching objects he does not want to crumble down. He does this by letting at least one of his fingers free from use while holding things. He employs a similar method when holding people hostage, threatening to disintegrate them if they don't comply or cooperate with him. If Tomura gets angered or frustrated, he is likely to drop his carefulness and break apart whatever he's holding at the moment.

Tomura seems to have improved his Quirk ever since its first appearance during the Unforeseen Simulation Joint Arc, as Decay's disintegrating speed has become noticeably faster in subsequent usages.

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Decay