Baneful Flourish

The target takes an extra 1d6 Necrotic damage from the cantrip, and it must succeed on a Charisma saving throw or be magically hindered. Whenever the target that fails this save makes an attack roll or a saving throw before the spell ends, the target must subtract 1d4 from the attack roll or save. At the end of each of its turns, the target repeats the save, ending the spell on itself on a success.

Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 1.