Bloodletting Brand

You cut deep into your flesh, drawing power from the blood spilled out of the wound. When you cast this cantrip, you lose hit points equal to twice your Warlock level (this damage ignores resistance and cannot be reduced). These hit points cannot be restored by any means other than a long rest.

Until the end of your next turn:

• Your next weapon attack or Eldritch Blast deals additional damage equal to the hit points sacrificed.
• The damage type is your choice of force, necrotic, or the same damage as the weapon used to cast this cantrip, to be declared on casting.
• If the attack misses, the sacrifice is not refunded.

If you kill a creature with the empowered attack, you gain advantage on your next HIT/DC before the end of your next turn.