Acid Spheres

By means of this spell, you conjure spheres of acid that hover around you. Any time a creature within 10' of you casts a spell at you or attacks you, you may use your reaction to have one of the spheres attack the target. Make a ranged spell attack at the creature. If you hit, it takes 2d10 acid damage, and it must make a Dexterity saving throw to avoid take the same damage again at the end of its next turn. It can also use its action to make a Dexterity save to avoid taking acid damage again.

At Higher Levels: When you cast this spell using a 6th or higher level slot, the initial damage increases by 1d10 for each slot level above 5th.