Wall of Thorns

You create a wall of tough, pliable, tangled brush bristling with needle-sharp thorns. The wall can be up to 60 feet long, 10 feet high, and 5 feet thick. When a creature enters the wall's area or starts its turn there, it must make a Dexterity save, taking 7d8 Piercing damage on failure, half on success.

Both dimensions increase by 10 feet and damage increases by 1d8 per slot level above 6.