Levianth

Levianths are an underwater race of giant beings. Their precise physical description is unknown. The Levianths worship Maelrawn, god of the deep. In order to pay him tribute, the Levianths raid the sunken halls and Deep Vault for treasure, bringing them into conflict with its defenders, the Slithereen Guard. At Crey, an army of Levianths clashed with the forces of Slithice, and was repelled. However, a single chalice was found missing afterwards, which may have been taken by the Levianths.