The Holy Medicinal Order needs your help. They have recently found some mutated rodents in possession of healing artifacts of the ancients. These artifacts must have come from a local anomaly – a small hill, “of a shape not normally found in nature.” What strange magic powers of the ancients are at work? Is your party up for the task of investigating this anomaly? Horror at the MERCC is a second-level, horror-themed adventure for the Mutant Crawl Classics system. This is a fully illustrated, 36-page, self-contained adventure designed to be dropped into any MCC campaign setting.