Sirens

The Realization of Desire: the temptation of the siren

 * In Greek mythology, the Sirens were three dangerous bird-women, portrayed as seductresses who lured nearby sailors with their enchanting music and voices to shipwreck on the rocky coast of their island. While Sirens do originate in Greece, this is not wholly true to their nature.
 * Sirens are born as such. A Siren’s true form is that of a ugly, hairless, vaguely-humanoid monstrosity with gaunt, inhuman facial features. They are able to take on multiple forms, usually human, to trick their prey.
 * In ancient times, they lived on islands and forced sailors to chase them, driving their ships onto the rocks.

Desire to Feed: the hunting habits of sirens

 * Unlike many monsters, Sirens do not technically feed on humans. Instead, they feel an intense rush of pleasure when their victims carry out atrocities against other loved ones.
 * By using a sort of venom gland in their mouths, Sirens can infect people with large doses of the hormone oxytocin. Victims with this much of the hormone in their systems experience an intense sense of euphoria and love for the creature that extends beyond just the physical and/or sexual realms.
 * Like the people they infect, the intense feelings of euphoria do not last long and they quickly grow bored with their targets and venture off to find others.

Skills Beyond Measure: the abilities and skills of sirens

 * Telepathy: Sirens can read the minds of their targets, learning what it is that person desires and yearns for in others and then giving that to them through illusion. This includes not just physical characteristics, but also mental ones.
 * Shapeshifting: Sirens can alter the perceptions into anyone befitting their target, so they can get close to their victims and infect them with their essence.
 * Venom Compulsion: Once infected, the target becomes completely and utterly enthralled with the Siren and is willing to do anything to prove their love and devotion. The compulsion is so powerful that they do these things regardless of personal beliefs, desires, morals or of the consequences resulting from said acts.