Vampiric Charm

Starting at 7th level, you can target one humanoid you can see within 30ft, if the target can see you, the target must succeed on a Wisdom saving throw against a DC equal to 8 + your proficiency bonus + your CHA modifier, or be charmed by you. The Charmed target regards you as a trusted friend to be heeded and protected, Although the target isn't under your control, it takes your requests or actions in the most favorable way it can, and is a willing target for feeding. Each time you or your companions do anything harmful to the target, it can repeat the saving throw, ending the effect on itself on a success. Otherwise, the effect lasts 24 hours, until you are destroyed, on a different plane of existence, or you take a bonus action to end the effect.