SRD

Wall of Thorns

6-level Conjuration

You create a wall of tough, pliable, tangled brush bristling with needle-sharp thorns. The wall appears within range on a solid surface and lasts for the duration. You choose to make the wall up to 60 feet long, 10 feet high, and 5 feet thick or a circle that has a 20-foot diameter and is up to 20 feet high and 5 feet thick. The wall blocks line of sight.   When the wall appears, each creature within its area must make a Dexterity saving throw. On a failed save, a creature takes 7d8 piercing damage, or half as much damage on a successful save.   A creature can move through the wall, albeit slowly and painfully. For every 1 foot a creature moves through the wall, it must spend 4 feet of movement. Furthermore, the first time a creature enters the wall on a turn or ends its turn there, the creature must make a Dexterity saving throw. It takes 7d8 slashing damage on a failed save, or half as much on a successful save.
At higher levels: When you cast this spell using a spell slot of 7th level or higher, both types of damage increase by 1d8 for each slot level above 6th. 7th level: 8d8 piercing/slashing damage 8th level: 9d8 piercing/slashing damage 9th level: 10d8 piercing/slashing damage