Not much is known about Desolatus' early history besides the fact that he was created by Makura.
An unknown event happened and he was presumed dead.
In Mentality , Desolatus is discovered being sedated in the Abandoned Hospital. Upon being awoken, he says several cryptic things. Afterwards, he battles Neisan , Aron , and Burukku in a perverted manner. Upon being defeated, he reverts back to normal before being crushed when the ceiling collapsed.
Desolatus is portrayed as being cryptic, Dark, and twisted. He is considered a pervert by most.
- Malevolence Manipulation
The forms that Desolatus morphs into when fighting in order are: Formless Black Liquid, Dark Octopus, Dark Spider, and Dark Dragon.