Although beautiful, mermaids do their best to lure men and ships to doom with songs of unparalleled beauty. Any adult male of any species who hears the siren's song must roll against Id every minute to resist the call. Victims who fail the roll do their best to reach the siren at their maximum possible speed. Mermaids usually sing from atop a coral reef or asteroid, with predictable results. The reshlin are an incorporeal race.
Incorporeal immortality lacks the fine sensations of life, however.
After all this time, the reshlin have decided that incorporeal immortality, to put it mildly, reeks. They covet living bodies. A reshlin can take control of a body by slowly subverting the creature's nervous system. If the reshlin wins the contest, it possesses the target's nervous system. On a successful Magical Familiarity roll, he recognizes the symptoms of impending reshlin possession.