Koraichi

is a kekkei genkai inherent to those of Jinpachi's clan in. Similar to Sage Transformation and its parent kekkei genkai, Korachi allows for the passive absorption of natural energy resulting in a type of transformation. The Dragons of the Ryūhone Desert only allow themselves to be summoned by those who master this kekkei genkai.

Usage
Users of Korachi, much like animals, are naturally adapted to the absorption of natural energy and the application of this energy to their chakra. The result is a very refined chakra that has properties of senjutsu chakra. By applying this chakra, then, to their bodies, the users rapidly undergo a type of Sage Transformation: usually causing them to look or.

As a result of this, the users have similar characteristics to Sage Mode: enhanced senses, physical strength, speed, and durability. In addition, their techniques are more potent and dangerous than normal techniques. According to Jinpachi, users of this kekkei genkai were exceedingly rare among his clan, and even fewer of them were able to retain control of themselves while transformed and thus gain access to the more powerful stages of the transformation. He assumes that he is the first clan member in over a century to achieve such a feat.

The basic technique provided by this kekkei genkai is, a type of Sage Transformation tailored to the clan's unique bodies.

Trivia

 * Due to their similarities, it is possible that Jinpachi's clan, and therefore this kekkei genkai, are closely related.