A new level has been discovered beneath the Castle of the Mad Archmage! On the western edge of the 5th level, new corridors have appeared, leading off into unknown regions of the dungeons. An expansion module for Castle of the Mad Archmage.

A mega-dungeon that supports a full-year campaign. A legendary adventure considered by many to be one of the greatest of all time! Explore a thousand-year-old dungeon mystery waiting to be solved...