With a swift gesture and a command word, you alter the course of an attack. When a creature within 30 feet of you makes an attack roll, you can use your reaction to impose disadvantage on the attack roll.

Additionally, if the attack misses, the attacker must make a Dexterity saving throw against your spell save DC. On a failed save, the attacker is knocked prone or pushed 10 feet away from you (your choice). On a successful save, the attacker is unaffected.