From publisher blurb:
The Purple Mountain series is designed to be a classic mega-dungeon. You know the kind...
It doesn't have a grand plot or even a consistent theme level to level. Instead, it has pathways to the subterranean realms, prisons for demons, ancient ruins, lost civilizations, legendary weapons, mysterious magic, mines, slave pits, elemental nodes, water-filled passages, mazes, trick doors, traps, haunted levels, classic monsters (ropers, trapper, mimics, otyughs [especially otyughs], owlbears), dragons, monsters too big to have ever fit down those hallways, and artifacts!
A classic mega-dungeon with everything wrong and right about it!