Due to a mutation in his DNA, Tsukori Hōzuki cannot use Shikotsumyaku. However, he can use his Steel Release to harden his bones in such a way, that even the impact of a Tailed Beast Ball it is said to be not enough to break them. This gives Tsukori an immense advantage over any type of opponent.
Kekkei Genkai, Hiden, Ninjutsu