Hey y'all, I want to build a character around manipulating life force and healing teammates using health stolen from enemies. I'm mostly building it around this feature

Bloodthirst. You can drain blood and life energy from a willing creature, or one that is grappled by you, incapacitated, or restrained. Make a melee attack against the target. If you hit, you deal 1 piercing damage and 1d6 necrotic damage. The target’s hit point maximum is reduced by an amount equal to the necrotic damage taken, and you regain hit points equal to that amount. The reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.

Feast of Blood. When you drain blood with your Bloodthirst ability, you experience a surge of vitality. Your speed increases by 10 feet, and you gain advantage on Strength and Dexterity checks and saving throws for 1 minute.

While achieving bloodthirst on one creature will give me advantage on grappling another creature, and I could couple that with spells like Bane to increase the likelihood. I was debating on multiclassing into Monk (Way of Long Death) with the combination of Tavern Brawler feat to give me a strong unarmed opening to grappling, mobility to arrange a grapple, and additional temporary health. What do you guys think? Would it be a waste, or too MAD?