Blood Needle

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 world around the caster, 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.