The octopus folk and squid-folk of the deepest, darkest parts of the ocean are shrouded in mystery. The Merfolk fear and despise them as practitioners of dark magic. They are said to be some of the most intelligent and powerful magi in the world.
Some octopians have octopus-like heads, with tentacles surrounding their mouths, while others have human heads and octopus tentacles in the place of legs. Exactly why their forms are so random is unknown, but it may have to do with their dabbling in the arcane, resulting in mutations and corruptions of the flesh.