Marel

Marels are a distinct evil aquatic elven race worshipping Umberlee. They were normal aquatic elves until they refused to help the human city of Northkeep in 400 DR, and they then got banned, much like the drow did, by the gods and their appearance changed.

"Mysteries of the Moonsea" p. 77

"TSR-9474 The Moonsea" p. 63