Blood Bolt

After the caster injures themselves, a glowing red bolt of blood is fired at a creature within range. Make a ranged spell attack roll. On a hit, the target suffers 1D12 Necrotic damage. A small amount of blood must be sacrificed in order to cast this cantrip, requiring 1 Hit Point to be sacrificed by the caster per bolt before casting this cantrip. 

The spell creates more than one bolt when you reach higher levels: two bolts at 5th level, three bolts at 11th level, and four bolts at 17th level. You can direct the bolts at the same target or at different ones. Make a separate attack roll for each bolt.