Cloak of Brambles (Arteria)

Spiked protrusions cover your body, granting you a +2 to your AC. Whenever a creature within 5 feet of you hits you with a melee attack, the attacker takes 2d6 piercing damage.

At the start of each of your turns, you can deal 1d6 piercing damage to one creature grappled by you.

At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for every spell slot above 1st.