As an action, you unleash a whirlwind of strikes, becoming a swirling force of destruction.
Each creature within a 5-foot radius of you during Whirlwind must make a Dexterity saving throw, with a DC of 8 + your weapon attack modifier. You can choose for each target to have advantage on this saving throw. On a failed save, a creature takes damage equivalent to your weapon attack's normal effects. On a successful save, the creature takes half damage.   While under the effect of Whirlwind, you can move up to half your movement. This movement does not provoke opportunity attacks from creatures you hit with this ability.