"Scholars call it The Prison. Existing since the dawn of time, this sinister place is run by a supernatural being. The most powerful heroes of the land must endure its trials, for he leaves them no choice. And once ensnared, those unfortunate souls must escape before The Keeper corrupts their pride." This devious puzzle-solving dungeon (like Tomb of Horrors) is for 10th-14th level characters, BYOC or characters provided.