Thorn Barrier

A swirling cloud of thorns surrounds the target, slashing out at any attackers who come close. Any creature that starts its turn within 5 ft of the target take 2d4 piercing damage. Whenever a creature makes a melee attack against the target, they must roll a Dexterity DC (10 + the level this spell is cast as) save throw or take 2d4 piercing damage. Alternatively, the target can expel the thorns in a 25 ft radius as a bonus action and the creatures in range must make the same dexterity throw as if they made a melee attack.