I think the game really needs a "dark healer" and Necromancer fills that role perfectly fine. The Necromancer doesn't need undead minions (even though I think it should have) but it would definitely be a debuff→heal class. Dark spells like Aspir/Drain, Absorb-HP or similar, and a 2-handed scythe wielded like a staff would be the perfect thing for the Necromancer.

It would be my main class for sure. Of course I'd love a Necromancer DPS caster with minions and all, but seeing how Yoshi-P and his team really hate pet-classes we'd be lucky if we get the BST as restricted, so a pet-less Necromancer debuffer-healer would be and absolutely amazing addition.