Mana Barbs

Grasping vines covered in glowing red thorns sprout from the ground in a 40-foot square starting from a point within range. For the duration, these plants turn the ground in the area into difficult terrain.

A creature in the area when you cast the spell or that ends its turn in the area takes 2d6 piercing damage and must succeed on a Strength saving throw or be restrained by the vines until the spell ends. A creature restrained by the vines can use its action to make a Strength check against your spell save DC. On a success, it frees itself.

When a creature in the area of this spell casts a spell, each creature inside the area takes 2d6 piercing damage as the thorns lash out.

When the spell ends, the conjured vines wilt away.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the the damage increases by 1d6 for every 2 levels above 4th