Mōryō

(魍魎, Mōryō) is a large, dark demon that is said to have been born in the land of demons.

Background
Mōryō tried to destroy the world and create a, and a clan of shinobi had borrowed his Ghost Army to help him achieve this goal. However, he was stopped and sealed away before he could do so by Miroku, the high priestess of the Land of Demons. His soul was sealed in the Land of Demons, and his body in the Land of Swamps.

Many years later after being destroyed by a powerful ninja. Mōryō was reborn after absorbing the hate and vengence. After bring reborn it was sealed within a powerful ninja the same way it was sealed the first time.

Appearance
Mōryō is a gigantic serpentine creature with a very long and dark purple body, and multiple dragon-based heads, at least four are seen. His eyes are glowing red, and the tongues are blue. There is a lighter purple aura surrounding his body.

Trivia

 * While not realy a tailed beast it is classified due to it being simular...or something.