Hungering Blade

You imbue a weapon you are holding, or your Unarmed Strikes, with ravenous negative energy. For the duration, when you hit a creature with an attack using the empowered weapon or Unarmed Strike for the first time on a turn, the target takes Necrotic damage equal to your spellcasting ability modifier, and you gain a number of Temporary Hit Points equal to the Necrotic damage dealt.