As a reaction, which you use when a creature that you can touch or see within 10 meters of you attacks you or another creature, you can cause light to flare before the attacker before it hits or misses. You impose disadvantage on the roll. An attacker that can’t be blinded is immune to this feature.

Augment

You can expend 1 additional mana so the creature has disadvantage on attacks until the start of its next turn.