Blood spikes

You use pices of your blood to conjure spikes, within a sphere of an 5 ft. radius, at a point you can see within range. Each creature within that spehre must make a Dexterity saving trow. On a failed save, the creature takes 4 d8 of piercing damage or half as much on a succsessful one.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for each slot level above 2nd.