"Abaddon." Ash replied coldly, their eyes full of hatred as they spoke the demons name. 

"Uh...who?" Max asked, raising an eyebrow. 

"Abaddon, a Mimic demon who can appear as anyone; demon or Breather. Beetlejuice and I know them from our time in the Netherworld. You could say we were friends but after some of his antics, we couldn't take it anymore. He was upset, but I never thought he'd go this far."