Acidic Amara

You partially transmute your body into acid. Until the spell ends, you have resistance to acid damage as well as nonmagical bludgeoning, piercing, and slashing damage, and a creature that hits you with a melee attack or any attack made with any part of its body while within 5 feet of you taking 2d8 acid damage.

At Higher Levels.  When you cast this spell using a spell slot of 3th level or higher, the acid damage increases by 1d8 for each slot level above 2nd.