Map loops after frozen aquarium - missed required quest?

magarity

From the frozen aquarium the exit to the upper right leads to a transition area but that just leads back to the aquarium downstairs where the slaves were hiding from the frost salamanders. I've rescued all the slaves (salamanders' and frostbite's) gone through the giant's cave and got the giant king's token, so what else am I missing? Is there some secret combination of doors to get to the lower Dorn's Deep?

simples

did you explore the entire transition area? if so, check your map while you're there, it should give you annotations as to which cave leads where

magarity

Oops, yes, it was hidden in the far lower right, thanks!