Blood Curse

You curse a creature within 60 feet by dealing 1d4 necrotic damage to yourself with your athame. The target must make a Charisma saving throw, if they fail, they take 1d12 necrotic damage. On a success, they take no damage.

If you rolled a 4 on one of your d4 for self-damage, the target makes the Charisma saving throw at disadvantage. If you roll a 12 on any of your d12 damage die, you may roll one additional d12 of necrotic damage.

Cantrip Upgrade. This spell's damage increases by one die when you reach 5th level (2d12 and 2d4), 11th level (3d12 and 3d4), and 17th level (4d12, 4d4). At higher levels when you roll an additional d12 damage die, you may do so a number of times equal to the amount of d12s you would otherwise roll for damage.