Domain Expansion: Absolute Zero; Lunar Wasteland

You chant the words Domain Expansion:  Absolute Zero; Lunar Wasteland creating a sphere around you with a radius of 30ft trapping all creatures inside until the Domain closes. Creatures can still teleport or leave the domain by traveling to another plane. The domain warps space making the inside much larger than the 30ft radius of the original sphere. Above the caster a Bright light shines, like the sun in its brilliance, taking the form of the full moon. It's rays illuminate the surrounding icy mountains that create a wasteland valley were all affected now stand. The temperature, temperate before, drops far too close to Absolute Zero, slowing all effected by the domain by 20ft. The extreme cold and radiant light from the moon makes all effected take 5d8 cold damage and 5d8 radiant damage. For the spell's duration, creatures still in the spell's range on the start of their turn take an additional 5d8 cold damage (halved on a successful Constitution saving throw) and 5d8 radiant damage (halved on a successful Intelligence saving throw). All affected creatures have disadvantage on Constitution saving throws. The domain can be cast once per long rest. If the user's concentration is broken while the spell is still active, the spell ends.