Temporal Rift

3rd Level Coactimancy
Casting Time: 1 action
Range: 150 feet
Components: V S M (A pinch of sand)
Duration: Concentration, Up to 1 minute
Classes: Sorcerer, Wizard, Bard
You create a 20-foot-radius void centered on a point within range, in which time does not exist. No light can illuminate the area, and creatures fully in it are blinded. The void's area is difficult terrain. Any creature that starts its turn in the area takes 2d6 force damage. Any creature that passes through must pass a Dexterity save or take 2d6 cold damage.