You conjure an elaborate fortress made of magically hardened, interlocking blocks of snow and ice. The structure is a 30-foot cube with a 5-foot-thick floor, ceiling, and walls. It contains four arrow slits, a heavy door made of solid ice on each face, and interior steps leading up to the ceiling.
The fortress provides total cover to creatures inside. The walls, floor, and ceiling each have 200 hit points, an AC of 18, and are immune to cold, poison, and psychic damage. They are vulnerable to fire damage.
Inside the fortress, the air is perfectly insulated and calm. Creatures inside the fortress are immune to extreme cold weather effects and regain 1d6 hit points at the end of each hour they spend resting inside, as the restorative magic of the snow soothes their wounds.
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