Thread Shackles

Threads of Strand snake up through the ground around a creature that you can see within range, attempting to pierce through it and tether it to the ground. The creature must make a Strength saving throw. On a failed save, the creature takes 2d8 magical piercing damage and is restrained. At the beginning of each of the target's turns, it can repeat the save, ending the effect on a success.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 1.