Demon's Winter is a sequel to SSI's 1987 Shard of Spring, set two hundred years after the events of the original, and featuring a game world 32 times the size of the previous one.

The evil sorceress Siriadne was slain, the Shard of Spring was recovered, and peace and prosperity returned to the fantasy island of Ymros. Two centuries later, however, great numbers of aggressive monsters have suddenly appeared, devastating the region and its inhabitants. A party of five adventurers must band together in order to combat this threat, starting only with meager skills and supplies after a kobold attack on the now-ruined village of Ildryn. Ultimately, they must uncover the source of the beasts, as well as the unnatural cold that plagues the land, and ultimately put an end to both.