Snake Belly

Snake Belly (蛇腹化) is a Kirigakure Ryū: Makengi technique used by Shura with Fang.

Description
By applying a coating of blood along the length of their demon sword, the user can transform it into an elongated, lance-like weapon.

Trivia

 * When transformed, the Fang appears to take on a certain amount of sentience, growling and blinking.