Sharkmaids, an advanced female-only underwater kingdom are using magic to slowly raise the water level of the world with the goal of conquering the surface world by sinking it until only ocean is left, and transforming all of humanity into aquatic creatures
The sharkmaids have shark-like features, turqoise skin and shark tails
Nerissa, green-eyed blue and green hair, is the sharkmaid leader
Sharkmaids are deceptive, subtle, scaled, with needle sharp teeth, and ethereal voices