Crystal Blood

The caster pricks their body (users choice on area) and sends there blood to a point 120 ft in front of them they can see. The blood expands and transforms into crystal spikes in a 25 ft radius. All creatures must make a Dex saving through to take half damage on 6d8. Caster gains 3 HP per enemy hit.

At higher level: When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3rd