Unda

The Unda are an aquatic race of sirens that dwell in the seas of their homeworld.

Biology
When submerged, the Unda resemble the mythological mermaids. However, when they emerge from the waters, they take on their true forms. They have green skin, a mass of cephalopod tentacles, sharp teeth, and looming fish fins on their backs.

Culture and society
The Unda are attracted to bright and shiny object. They prey upon traveling ships, using the water to warp their appearances to ensnare their prey before its too late.