I couldn't miss the chance to practice my drawing!
A fabled katana that can sever dreams. Though renowned for slaying demons, the blade has an innate thirst for blood, and will occasionally steer its wielder's strikes towards the enemy's neck.
Onimaru is a level 60 katana that provides +34 Bravery, +58 Attack, -1 Defense, and EX Intake Range +1m. However, the weapon can only be obtained, and used, within the Labyrinth. It can be obtained from the shop by trading 1 gil, Sorrow of Conflict, and Giant's Dream x2.
Oni is the kun'yomi rendering of the Chinese interpretation of an ogre called the "guǐ" (gu-ay). They are a kind of yōkai from Japanese folklore, variously translated as demons, devils, ogres or trolls. In a Chinese context it may refer to a ghost as well.
Maru means "circle" in Japanese.