Domain Expansion: Absolute Zero; Lunar Wasteland(incomplete domain)

You chant the words Domain Expansion:  Absolute Zero; Lunar Wasteland creating a sphere around you with a radius of 25ft or taking the shape of any building you are in. Foes inside can escape by walking out of the domain. The Ground gets covered by a thick layer of ice and snow slowing those effected by 20ft. The air chills and those effected in the domain take 3d8 cold damage per turn and on opening the domain(halved if successful on a constitution saving throw). This can only be cast with 5th level spell slots and higher. The domain closes once the casters concentration ends.