Corrosive Skin

Your skin erupts into a green scaly appearance with a putrid smell, and you gain resistance to acid and poison damage for the duration. You can end the spell early by using an action to dismiss it.

Whenever a creature within 5 feet of you hits you with a melee attack, the attacker must succeed on a Constitution Saving Throw or take 3d8 acid damage and their Armor Class is reduced by 2 until the end of your next turn.