Cloak of Light

As an action on your turn, you surround yourself in a cloak of light. While the cloak is active, undead and fiends have disadvantage on attack rolls against you, and if they hit, they take 10 radiant damage. Additionally, whenever something hits an attack against you, it must make a dexterity saving throw. On a successful save, they take 5 radiant damage, and on a failed save they are blinded and take 10 radiant damage.