Magical darkness spreads from a point you choose within range to fill a 30-foot-radius sphere for the duration. The darkness spreads around corners. Non-magical light, as well as light created by spells of 5th level or lower, can't illuminate the area, and creatures with darkvision can't see through it.

The area inside the darkness is lightly obscured and frigid cold. Any creature that starts its turn within the sphere must make a Constitution saving throw. On a failed saving throw, a creature takes 4d6 cold damage and its speed is reduced by 15 feet until the start of its next turn unless it has resistance or immunity to cold damage. On a successful saving throw, a creature takes half as much damage and its speed isn't reduced.