Thorn Blast

Choose an area within 60ft. Throwing the rose to that point it plants itself into the ground, regardless of the terrain. The rose suddenly ejects all of its thorns outward at an incredible speed in a 15ft radius. All creatures in that 15ft area must make a Dexterity saving throw, taking 18 (6d6) piercing damage on a failed save or half as much damage on a success.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.