Angelic spirits flit around Storm Sentinel in a 15-foot Emanation for the duration. Storm Sentinel can designate creatures to be unaffected. Any other creature's Speed is halved in the Emanation. Whenever a creature enters or ends its turn in the Emanation, it must make a DC 16 Wisdom saving throw. Failed save: 13 (3d8) Radiant damage. Successful save: half damage. A creature makes this save only once per turn.