A party of unassuming mercenaries have been kidnapped and taken to the Empyrean, the mysterious, alien otherworld that hovers on the edge of material reality. After a period of unconsciousness they awake to find themselves as experimental subjects in the extremely hazardous Ios Library. Trapped in a world they have only read unpleasant stories about, and hounded by the disturbing creations of the Library’s amoral elven masters, the party is finding themselves occupied with just keeping themselves in one piece, though swag and power are very prominent secondary goals.