Rat-Maso

Rat-Maso is a boss within Elder Tale and appears in the form of a giant, level 68 Rat-Man. It apparently has a reeking odor.

Depths of Palm
Shiroe,Naotsugu and Akatsuki encountered Rat-Maso within the Depths of Palm, concluding that it must be the reason the dungeon is falling apart. They decide to take the risk and destroy the Boss clearing a way to the end of the dungeon.