Temple of the Locust Lord (2011)

Publisher's blurb:

Temple of the Locust Lord is a Pathfinder Roleplaying Game compatible module designed for four 1st level characters that uses the medium XP advancement track. This module is designed to be played in any campaign setting with a mountain containing a megadungeon.

Temple of the Locust Lord pits the characters against the minions of the demon known as the Locust Lord.

The Purple Mountain series is designed to be a classic mega-dungeon. You know the kind...

It doesn't have much in the way of plot or even make a lot of sense from level to level but it will have: pathways to the subterranean realms, prisons for eldritch demons, ancient ruins, lost civilizations, legendary weapons, unexplainable or lost magic, mines, slave pits, elemental nodes, water-filled passages, mazes, one-way doors (heck secret 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!