This mob spawns at -5420, -2704 standing outside the northeast outer wall of the Hermit hut.
Appears only during the Frostfell period around december.
Findable (via Ctrl-F): No
You say, 'Hail, Gritt Gigglegibber'
Gritt Gigglegibber says, 'Kuutas sent you, right? Well, take your list of creatures and go out there and try to kill them. I'll need a healthy brainstem from five of them in order to make a strong enough potion.'