Moonbeam

A silvery beam of pale light shines in a 5-ft. radius, 40-ft. high cylinder centered on a point within range. When the beam appears, when it moves into a creature’s space, or when a creature enters or ends its turn there, that creature makes a CON save, taking 2d10 radiant damage on a failed save, or half on a success. Shape-shifted creatures that fail revert to their true form while in the beam.