Siren

Behavior: Sirens are very secretive and shy creatures, keeping to the lower depths of the ocean during the daytime and preying using an ambush method with it's bioluminescent 'lure' that has a distinct human shape. Waving the tendril attached to said lure and flexing muscles within the appendage to contort the arms of it, sirens simulate a drowning victim almost flawlessly to attract prey before lunging forward with a gaping maw filled with razors to chew its prey to shreds. Should something larger than its mouth approach, the lure will instantly go dark and the siren will flee with a jarring high-frequency screech. Once the sun sets, however, these cunning predators migrate towards the surface in pursuit of easier prey such as mundane marine life, ghost whips, fiend shrimp, and specifically altruistic sea vessels.

Details: Sirens navigate and communicate using vocalizations that are strikingly similar to female 'singing' which serves a dual purpose for attracting sentient prey as well. In rare situations up to 3 of these actually large creatures (measuring up to 10ft/3 meters) have been know to hunt in temporary packs to attack larger prey and vessels. Possessing a hominid upper body that tapers down into the tail of an eel, they prove to be quite versatile in both hunting and fleeing. Known to be the mothers of the rare Sirensong.