Seven Seas: Eo Picture

In my mythology, a landmass known as Athena's Island has been existing in between this dimension and another. Anything that rests there remains unaffected by the outside world until it is removed.

On this island are several strange creatures, including many surviving magical species from the seventh age of the universe (in which all the Greek, Norse, and some Asian mythological characters and species lived and died) like Goblins, Mandragoras, etc. A group of humanoid fish were amongst this vast menagerie, but they were all but wiped out by a wizard named Prospero in the eight (current) age of the universe, with only one surviving member named Caliban alive to recount the tales of his people.

Caliban's race worshipped the sea (duh), particularly seven spirits that looked over it. These spirits would take physical form from time to time, basing their bodies after humans and the dominate sea predators. Each represents one of the seven most dangerous seas of the current age of the universe. While they spent the previous ages traveling the globe, during the eight age they settled down in the temple built to them by the fish men and the island creator, Athena. They guarded this temple and its vast fortune: the armor and weapons of the great Greek heroes and "gods" of the seventh age of the universe.

Eo, the fourth member of the Seven Seas, is based off of the Basilosaurus of the Eocene period. Basilosaurus, despite the named, was actually a prehistoric whale that looked much like a sea serpent. Eo is the calmest of the Seven Seas, and the most willing to negotiate with others. She is still powerful though, being the most intelligent member of her group and the only member that uses weapons in combat. A menagerie of prehistoric whales, including a pair of Basiliosaurus, swarm around her island in the center of her chamber. At the back of the island is a small land bridge to the next chamber.

The Seven Seas were inspired by Discovery Channel's "Chased by Sea Monsters" special, in that they are made of the creatures featured on that special and listed in the same order as the seas on that special. They feature heavily in Tremere's Saga.
Olympian Goddess
Seven Seas: Eo
The Myth of Perseus and Medusa Tessellation