Thornskin

You channel fey magic to cause thorns to erupt across your
skin, making you a dangerous foe to grasp and capable of
delivering thorny attacks. Until this spell ends or you dismiss
it as an action, you can use your action to make a melee spell
attack. On a hit, the target takes 1d8 piercing damage.
While this spell is active, any creature grappling you or
creature you are grappling takes 1d8 piercing damage at the
start of its turn as the thorns cut into them.
This spell’s attack damage increases by 1d8 when you reach
5th level (2d8), 11th level (3d8), and 17th level (4d8).