ACKS: In Search of the Unknown
The Mistmarsh is an area of wet ground, grassland, shallow streams, and strange hazards that rests in a bowl-shaped depression in the middle of the Cairn Hills. It is named for the harmless mist that lingers from two hours before sunrise to until mid-morning, and again from several hours after sunset; the mist limits visibility and also seems to muffle sound.
Over the past year or so, the lizardfolk and troglodytes of the Mistmarsh have become more active, often creeping out of the swamp to raid isolated homesteads.
Most recently, a troglodyte was seen leaving the Inn of the Slumbering Serpent after robbing Nathanial Greenstone and Keyrock of the Cave People as they slept. The party pursued the troglodyte into the Mistmarsh, where the mists of Ravenloft took them. It’s unclear whether the Ravenloft mists and the regular Mistmarsh mists are related.