a cral ligi worker  

These spawn exclusively in the northern (Or hidden) section of twilight sea. Just Northeast of the Elemental Island is a small, underwater tunnel that's the only access point for this section. Cral Ligi, Vas Ren, Grol Baku, Rhino Beetles, and Underbulks populate this area. Several mobs that drop parts for the various Twilight Sea Armor quests spawn in this area, as well as the Cral Ligi that have an exceptionally rare chance of dropping the Bottomless Box.