Iggnit-gnt is an abomination sealed by ancient tomes of the Mayans. It is a giant blob that devours everything in its path.
When Albert accidentally read the tomes, he let out the being. Ironically enough, Albert was the only person this monster couldn't absorb. Instead he decided to go after everyone else.
It took a few ass kickings from Jebidiah to finally put the monster back in its tome.