Oh yes please! I'd love this

Necromancer, Blood Mage, Saboteur or even Shaman could do the work as potential names.

Other than basic healer skillset with dark aesthetics I can see it having:
- 1 ability that evens out party HP
- 1 large ground AoE that drains HP from the enemies and destribute to allies inside it
- some debuffs for enemies
- a sort of Living Dead ability but to use on an ally
- a spell that heals using HP instead of MP