Acid Sheath

You enclose yourself in a fluid sheath of acid that does not harm you.You can breathe normally and cast spells while the acid sheath is present, however you cannot wield nonmagical weapons or shields for the duration. Additionally, you gain the following benefits:

• Any creature that hits you with a melee attack within 5 feet of you takes 2d4 Acid damage.
• If you are grappled, other creatures in the grapple takes 2d4 Acid damage once per round at the beginning of their turn.
• You cannot be restrained by non-magical means.
• You have resistance to acid damage.
• When you deal Acid damage while the sheath is around you, deal 1 extra point of Acid damage per die.