Thorn Binding

You cause a mass of spectral vines to appear around a creature. The target must succeed on on a Dexterity saving throw or be restrained and surrounded by 6 grasping vines. On a success, the target is not restrained and has half as many vines surrounding them.

Whenever the target is hit by an attack they take an additional 1d6 piercing damage and one of the vines is destroyed. When all vines are destroyed the spell ends. A creature restrained by this spell can make a Strength or Dexterity check (it's choice) against your spell save DC, on a success they are no longer restrained.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, 2 more vines appear for each slot level above 3rd.