The den

Grimmon is an Adult undead virus type, a representation of various church grim variations in folklore. The leather belts are holding his decaying body together, and he specializes in electricity-based abilities. The ghostly flames on the tip of his tail are said to be used to either save travelers lost in the forests and bogs and guide them to safety, or lead them deeper to their deaths.

Her main and original evolution is Ophanimon, one of the ten Archangels and servants of Huanglongmon, also referred to as "Their Constellation/Stars" or "The Highest of High" in ancient past. In that form she was created, and in that form she served their ruler as a guardian of the nascent Digital world.