Source

Mt. Gulg

Description

Summon your forgiven hate minion. Having repented its sins, it poses no danger.

Journal

A sin eater-esque something or other found on Mt. Gulg. Though it follows you relentlessly, as if driven by hate, it can do little save flutter about and occasionally unravel itself. There seems to be no harm in keeping it with you for now...

Tooltip

I'm just going to assume that cube is an eater.
   - Thancred