Ella's Arcanum - RPG Essentials #2 - Siren - DnD/Pathfinder/TTRPG

Imprisoned inside a mist-filled chamber in the Tomb of Horrors, Siren serves as evidence of Acererak's heartless sense of humour. This mysterious fey creature yearns to be released, but an enchantment laid on her by the demilich prevents her from telling visitors how to accomplish that task. If anyone succeeds in freeing her, she vows to be a lifelong friend.