Calamity

A rather chaotic bismuth crystanium entity who does whatever he feels like, Calamity is an annoying guy who shows up, causes chaos, and then fucking dies. While the net is currently working on a way to render him permanently dead, that hasn't been figured out yet. His favorite hobbies include giving people things with random results, creating deals where he gets souls, being a general bastard, messing with Sera, and doing things without absolutely no ramifications for their consequences.

Backstory
Not much is known about where the hell Calamity came from. He just showed up one day. However, it's been deduced that Scale is to blame for his existence, likely through a similar process of how The Librarian was made.