Toys in the Attic

From publisher blurb:

A renaissance has begun in the frontier town of Haven. Not of art, science, or religion, but of adventure. Artifacts have been excavated from the ruins of Parlainth, prompting adepts from all corners of Barsaive to pour into the city, hoping to make the next discovery. Some adepts, with the backing of wealthy patrons, came prepared for the dangers they may face. Others arrive seeking fame and glory with nothing but the clothes on their backs and the weapons on their belts.

To improve their odds of survival, most adepts choose to work with others. This led to the formation of five adventuring companies, which have since prospered.