From the introduction: For decades, the Pathfinder Society and the Aspis Consortium have clashed with one another. Usually these skirmishes occur far from either’s headquarters, where a handful of daring agents might fight within an unexplored ruin beneath the veil of plausible deniability. It’s a proud tradition that has kept the conflicts restricted to personal rivalries that rarely touch the rest of their respective institutions. From the introduction: For Tier 12 - 15.