Crown of Thorns

You conjure a massive wooden hand of long, hardened thorns in a 15-foot Cube centered on a point within range. Each creature in that area takes 8d4 Piercing damage. A creature also takes this damage if it enters the Cube or ends its turn there or if the Cube moves into its space. A creature takes this damage only once per turn. Creatures that fail a STR save (DC 12) are Restrained for the duration. A creature caught this way may make the save at the start of its turn. 

On your later turns, you can take a Magic action to teleport the Cube up to 30 feet.

Using a Higher-Level Spell Slot. The damage increases by 2d4 for each spell slot level above 5.