Frosthaven is the story of a small outpost far to the north of the capital city of White Oak, an outpost barely making it through the harsh weather as well as invasions from forces both known and unknown. There, a group of mercenaries at the end of their rope will help bring this settlement back from the edge of destruction. Not only will they have to deal with harsh elements, but there are other, far more dangerous threats out there in the unforgiving cold as well. There are Algox, the larger, more yeti-like cousins of the Inox, attacking from the mountains; Lurkers flooding in from the northern sea; and stories of machines that wander the frozen wastes of their own free will. The party of mercenaries must face all of these perils, and perhaps in doing so, make peace with these new races so they can work together against even more evil forces.

Frosthaven is a standalone adventure from the designer and publisher of Gloomhaven that contains sixteen new characters, three new races, more than twenty new enemies, more than one hundred new items, and a new, 100-scenario campaign. Characters and items from Gloomhaven will also be usable in Frosthaven, and vice versa.

In addition to the well-known combat mechanisms of Gloomhaven, Frosthaven will feature much more to do outside of combat, such as numerous mysteries to solve, a seasonal event system to survive through, and player control over how this ramshackle village expands, with each new building offering new ways to progress.

Frosthaven has a whole new set of items but there's a mechanic for bringing items over from 'Gloomhaven'. However, as it is a remote location, these products will get imported and are not there as standard. Resources are much more valuable and you will have to build items through a crafting system rather than just buy them.