"Hypothermia is a Dungeons and Dragons adventure module intended to supplement Icewind Dale: Rime of the Frostmaiden, pitting a Tier 2 party against a vicious bheur hag during Auril's Everlasting Rime.
When a group of experienced hikers fail to return home after a dangerous arctic excursion, adventurers will have to brave the endless storm to find them. Along the way they can negotiate with a flameskull, venture to a world of warmth beneath the ice, and make fragile, icy alliances on the frozen wasteland.
This 3-4 hour adventure is optimized for 6th level characters but can be played throughout the 2nd tier of play. It features new monsters, new magic items, and new encounters in the frozen north."