Acid skin

You cast Acid Skin on you or a willing ally. And the skin turns wet and dripping green and yellow liquid.

They have acid immunity unless the Acid damage is more than 60 then it turns to resistance damage also fire and necrotic resistance. 

Any enemy within 10 feet takes 1d6 acid damage, any enemy that attacks with melee weapons take 4d4 acid damage 

This spell’s damage increases at set levels when enemies attack with melee weapons, when you reach 3rd level (5d4), 6th level (10d4+10), and 10th level (14d4+10).

Unarmed strikes gain +3 to attack rolls and 1 extra dice for damage rolls for unarmed strikes. 

Any allí that touches you also takes damage. And any objects that you touch after having the spell activated takes 1D6 damage each second.