Thorns of Bone

You cause nearby bone to animate and quickly grow piercing thorns in an area of up to 15ft. You choose the shape of the area. If casting the spell on a non-skeletal, living creature, the creature must make a constitution saving throw. If successful, the spell has no effect. If unsuccessful, the creature takes 3d10 damage, cannot move for its next turn, and all other creatures within the area take 2d10 damage. If casting the spell on sentient, willing bone, it does not need to make the saving throw, does not take damage, and you may cast the spell as a bonus action. 

At higher levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d10 for each level above 2nd.