Frostburn

Frostburn is a sourcebook for the 3.5-edition ruleset of Dungeons & Dragons. It focuses on cold-environment settings and creatures and has some elements related to the Forgotten Realms.

"Survival at Sub-Zero

Marrow-chilling conditions, deadly hazards, and other dangers threaten explorers of frostfell environments. Whether traveling through polar regions and frozen mountaintops to ice-glazed dungeons and the Ice Wastes of the Abyss, a wintry grave awaits those who venture forth unprepared.

This supplement for the D&D game explores the impact of arctic conditions and extreme cold-weather environments on every aspect of game play. Along with rules for adapting to, navigating through, and surviving hazardous cold-weather conditions and terrain, Frostburn also includes new spells, feats, magic items, prestige classes, and monsters associated with icy realms."