As a direct result of the mine exploration, another party followed the clues uncovered at the mine to a heretofore undiscovered ruin of an ancient city buried beneath a mountain. The Colonial Assembly let a wave of colonists form adventuring companies to explore the ruins in return for a percentage of the value of any treasure uncovered. The Order of the Cleansing Dawn also set up a shrine at the gates to let the adventurers quickly recover from their delves into the ruins.
The surviving party that solved the mine mystery joined the action in the ruins, and through some combination of accident and knowledge found their way to a temple complex somewhere deep within the city complex. They found a shirt and bracer that complimented a sword found in their previous adventure, and learned that their impression of the two alien races previously discovered—mutual hostility—turned out to be correct when the sword and the mace previously recovered reacted negatively to each other.
After a run-in with some giant vermin, which disabled the militiaman, they retreated to the surface and then returned to the city to recover and prepare for another expedition into the ruined city.