Ranguren

Ranguren (乱紅蓮) /Nue (鵺) is Yomi's  spirit beast , below Shizuru's Kuroford on the Spirit Beast Rankings. Despite this, it is one of the most powerful spirit beasts in the series, and has been known to battle Shiro, considered the mightiest of the spirit beasts, equally on more than one occasion. A nue (鵺) is a legendary creature found in Japanese folklore. It is described as having the head of a monkey, the body of a raccoon dog (tanuki), the legs of a tiger, and a snake for a tail. According to the legend, a nue can transform into a black cloud and fly. Due to its appearance, it is sometimes referred to as a Japanese chimera. Nue are supposed to be bringers of misfortune and illness.Ranguren is bound to the Isayama family's heirloom, the exorcism sword Shishio, which has been passed through the Isayama line for generations to its current wielder, Yomi Isayama, who, as an adopted child, is an outsider to the bloodline. Its most common attack is the "Roar Wave", which it blasts at foes to devastating effect; it can also fly, leap to immense heights in a single bound and use its razor-sharp teeth and snake-mane to attack whoever Yomi has it target.

Abilities
Due Ranguren (Nue) is a spirit beast, Ranguren (Nue) have a spiritual physical ability that enhance strength, Stamina and Agility into a fight. by spirit beast has common ability to conceal the presence of it or turn invisibility to the naked eye only the master have ability to sense Ranguren (Nue), bestowed by the Isayama family heirloom the spirit beast has been sealed into a katana. This Blade of katana is Darker althrough into the tip of the blade, also sharper blade even can cut solid object even metallic structure even spiritual entity. The Katana is indestractable due Ranguren has been sealed on it.
 * Houkouha- Ranguren (Nue) fire in his mouth a spiritual beam that direct damage to the opponent directed hit.