An Unknown Rogue's Skeleton
An Unknown Rogue's Skeleton is an infrequent loot item occasionally found on some monsters associated with the Plague of Despair event arc(i.e. Ant Lion). The skeleton is a container (one of at least two different shapes) that holds what you might expect to find on NPC treasure hunters, including basic armor pieces, weapons, tools, and a treasure map (Adept).(varies level 1-3?)
It should not be confused with the much rarer, and no longer spawning, container simply labeled "Bones".