Draxis' Dreadful Blade

You brand a creature with a necrotic curse as part of a melee attack. As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell’s range.

On a hit, the target suffers the weapon attack’s normal effects and becomes "gravebranded" until the start of your next turn.

If the gravebranded creature regains hit points before the spell ends, the healing is reduced by 1d8 necrotic damage. If this necrotic damage exceeds the amount of hit points restored, the creature instead takes the excess damage as necrotic damage.

This spell's damage increases when you reach certain levels. At 5th level, the melee attack deals an extra 1d8 Necrotic damage to the target on a hit, and the healing reduction increases to 2d8. Both rolls increase by 1d8 at 11th level (2d8 and 3d8) and again at 17th level (3d8 and 4d8).