Steel Release

The is a specialised nature transformation kekkei genkai. It is unknown what elements this nature entails. In Gaara Hiden, Metoro Kin'iro can use the nature to produce steel weapons. In Naruto Shippūden the Movie: The Will of Fire, Hiruko (who stole this nature from an unknown shinobi by using his Chimera Technique) turns his body to steel, making it virtually indestructible.

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