All the Lights in the Sky are Stars
3-level Conjuration
You form a 5-foot thick ring of dust and ice that circles around you, with the outer edge of the ring 10 feet away from you. When a creature enters the spell's area for the first time on a turn or starts its turn there, it must make a Dexterity saving throw. A creature takes 3d6 cold damage on a failed save, or half as much damage on a successful one.
As a bonus action on your turn, you can increase or decrease the ring's radius from you by 5 feet, to a maximum distance of 20 feet away from you. The ring retains its 5-foot thickness, but its radius grows or shrinks.
When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.
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