The Tetsuryu is a very rare, advanced nature kekkei genkai formed through the simultaneous use of lightning, earth, and fire-based chakra natures to create both Iron and Steel release. This Kekkei Tota appears in some members of the Yotsuki Clan. It has not appeared in a member of thde clan since the death of Yao, called the Great Dragon, during the First Shinobi World War. It allows the user to use Iron Release jutsu and was thought to be extinct until Mariko and her generation of the clan were revealed to possess it. There are two forms of it, but the conditions to unlock the second stage of the kekkei genkai have been forgotten.