Siren

The Siren was an insidious, tainted, shapeshifting creature, thought to be an especially vile kansen which dwelled in the Daylight Castle. Its true nature was to delay and confuse its targets, to more egregiously expose them to the corruption of the Shadowlands. If its true nature was revealed, it devolved to a greyish form, and it tried to flee farther into the castle to await new visitors.