A mere year past Cosolen was a genteel city in which the arts flourished. A terrible natural disaster changed all this. Though spared the calamity, the city is inundated with hardscrabble refugees that have overwhelmed its ability to accommodate them. Crowded into squalid tenements or outlying shantytowns, the newcomers have become pariahs and transformed the city guard into reviled oppressors. In this tumultuous new social order the unwelcome specter of plague has made its first appearance. It is up to a determined group of outsiders to wrestle with the mysterious origins of the Plague of Cosolen before it tears the city apart. The Plague of Cosolen is a HackMaster adventure located in the Kingdoms of Kalamar campaign setting. More specifically, this adventure focuses on the Kingdom of Cosdol and its capital city, Cosolen. It is designed to challenge four to six player characters of 3rd to 4th level. This edition has been updated to fully conform to post-basic rule updates.