Lord Regulus of the Ebon Order has hired your group to bring back a shard of crystal from a mine in the Great Wyrm Mountains. The mine is the work of degenerate fish-people, who extract the crystal for some foul purpose. Lord Regulus believes the crystal has other arcane properties. What other mysteries lie within the hewn corridors of the mountain? This adventure is based on a dungeon created for the #dungeon23 project. Old School Essentials: Advanced Fantasy will be used as the system. Pregens (2nd/3rd-level PCs) will be provided.