Withering Blade

Necromancy cantrip
Casting Time: 1 action
Range: Self (5-foot radius)
Components: S, M (a melee weapon worth at least 1 sp)
Duration: 1 round
You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you. On a hit, the target suffers the weapon attack’s normal effects and falls under a blood curse until the start of your next turn.
If the target regains hitpoints or gains temporary hitpoints by any means before then, it immediately takes 1d8 necrotic damage and the spell ends.
At Higher Levels. At 5th level, the melee attack deals an extra 1d8 Necrotic damage to the target on a hit, and the damage the target takes for gaining temporary hit points or regaining hit points increases to 2d8. Both damage rolls increase by 1d8 at 11th level (2d8 and 3d8) and again at 17th level (3d8 and 4d8).
Spell Lists. Cleric, Sorcerer, Warlock, Wizard