Erupting Spines

You hold a bone and look at a point you choose within range and then sharp spines erupt out of the ground impaling any creature with in range. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 8d6 necrotic damage on a failed save, or half as much damage on a successful one.

The bones dissipate after casting but leave small spikes in the area that was affected making it rough terrain lasting one minute.

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.