In the encounter he’s in the skull of a flying ape, I am ok with that but what’s got me scratching my head and can’t explain to my group is how did it get into the secret chamber without being seen by the bandits in the vault and without moving to 500 pound bed in front of the secret door. He’s in the body of the ape so he wasn’t able to control anyone with his device and there’s no other way into the room. Kinda overlooked that bit when writing the module I guess. Lol