Turnabout

When an enemy makes an attack against you, but before you know the result, you can use your reaction to cast this spell.  Until the start of your next turn, your AC increases by 3.  If the attack misses, you can deal 1d10 force damage to the attacker as part of the reaction.

At Higher Levels: When you cast this spell with a 2nd level spell slot or higher, the damage increases by 1d10 per spell level higher than 1st.