As a bonus action, choose one creature you can see within 30 feet of you. The target is cursed for 1 minute. The curse ends early if the target dies, you die, or you are incapacitated. Until the curse ends, you gain the following benefits:
• You gain a bonus to damage rolls against the cursed target. The bonus equals your proficiency bonus.
• Any attack roll you make against the cursed target is a critical hit on a roll of 19 or 20 on the d20.
• If the cursed target dies, you regain hit points equal to your warlock level + your Charisma modifier (minimum of 1 hit point).