Arcane Recoil

An aura of psychic energy bursts from you as a result of the arcane energy coming at you. When an opposing creature casts a spell that deals damage to you or an ally, you can use your reaction to cast this spell. Roll 2d10 and subtract it from the damage dealt to yourself or an allied creature, and deal psychic damage equal to the amount subtracted from the countered spell.

At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d10 for each slot level above 2nd.