Cult of the Lamb: Woolhaven is a 2026 full-length expansion for Cult of the Lamb, developed by Massive Monster and published by Devolver Digital. Set on a frozen mountain tied to a forgotten lamb god, it sends players to rebuild the lost settlement of Woolhaven while facing corruption called the Rot. The expansion adds winter survival mechanics, new structures, and two large dungeons, with access intended near the end of the base game.