The Deep Ones

The Deep Ones are a breed of Outer Spawn created by one of the Outer Beings, the Sea-Father, who views them as it's children. They harass and assault the Atlanteans. They serve the Dreamer in an endless crusade alongside his own children, seeking to one day claim all of Avarion's oceans for their father.

A Deep One and a number of cultists somehow made their way into the Caelan temple in Raven's Vale before or after the priesthood desecrated it following their overthrow by Laylanna and the Raptor Clan. Caine, Devan, Sienna, Malichi, Callie and others worked against them and liberated the temple, though at the cost of Devan's life.