Hardening

Hardening is a Quirk used by Eijirou Kirishima.

Description
Eijirou's Quirk gives him the power to harden any part of his body. The ability not only protects him from physical attacks, but also from heat and shock waves. Eijirou's hardening was able to withstand Bakugou's Explosions for an extended amount of time. It can be used as both the strongest defense and the strongest attack.

The drawback to the Quirk is that there is a limit to how much damage the hardened skin can withstand and will cause the hardening to slowly dissipate.