Down below the Thick there are creatures that can swim through the denser mists like fish through water. These creatures are massive and terrible to behold, scouring the aeroliths in the Gloom of all life in their efforts to stop their unending hunger. Collectively referred to as behemoths, each seems to be a unique creation of The Maelstrom, spewed forth in much the same way as the aeroliths themselves. Most of Solus’ faithful believe that the behemoths are Solus’ creations, sent to punish those who stray too far from her sight. Others claim that they are great demons, released from the Foundation by the awesome force of the Maelstrom.
While most behemoths can swim the mists all the way up to the Thick, the light of Solus that filters down through the mists at that height is still very unpleasant for them, and few endure it for long before returning to the Deep Mists.