A large, thin needle of corrupted blood forms in the air near the caster to be fired at a target. Blood is drained from the source provided as a material component, forming a thin needle composed of blood. Make a ranged spell attack against the target. On a hit the target takes 6d6 piercing damage and 3d6 necrotic damage and the target has to make a wisdom saving throw. On a failure they are vulnerable to necrotic damage and have disadvantage on all constitution saving throws before the end of your next turn.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d10 piercing damage for both each slot level above 4th.