Hardening can also only protect Eijiro from physical damage but not thermal damage such as very high or low temperatures. But, when he encountered Kendo Rappa, Eijiro showcased the ability to refortify his hardened form at will.įurthermore, Hardening is noted to lack long-range potential, limiting Eijiro's combat repertoire and forcing him to take battles up close. One of the drawbacks to this Quirk is that there is a limit to how much damage the hardened skin can withstand, causing Hardening to slowly dissipate, and Eijiro loses stamina from struggling to keep his Quirk active. Once he gains a power boost from the drug, this granted him the ability to grow rocks from his upper body, as well as make him bigger and stronger.Įven the toughest of defenses has its limits. The reason behind this may be that Hardening adapts to the delivered damage, and after being deactivated, the Quirk resets itself before reactivated again, in which the density of Hardening is more powerful compared to it's previous use.Īkira's version of the Hardening Quirk is only ever seen under the effects of Trigger. This fact, prior to Tetsutetsu stating it, was displayed as part of Eijiro's training, when he, in his hardened form, was continuously attacked by Mashirao Ojiro's Tail, and with each hit, the strength and durability of Eijiro's Quirk increased. This all leads to Hardening being a highly practical Quirk for Hero work, which is frequently combat-oriented.Īccording to Tetsutetsu Tetsutetsu, the hardness granted by Hardening can be improved upon when Eijiro, in his hardened state, takes more damage overtime.

Hardering makes Eijiro very effective in melee.Īside from increased defense, Hardening also grants Eijiro offensive power by turning his hardened body rough and sharp like rock, increasing his physical strength and allowing him to cut enemies by grazing them.

Even bullets are unable to pierce his skin. Once activated, Eijiro becomes capable of enduring what would be otherwise lethal hazards, like tons of falling metal and multiple explosions, without leaving a scratch. The Quirk protects them from most physical threats. Hardening gives the user the power to harden any part of their body.

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