Steel Release

The is a combined nature transformation  kekkei genkai. It is unknown what elements this nature entails.

Forms

 * In Gaara Hiden, Metoro Konjiki from Ishigakure 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 into steel, making it virtually indestructible.

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