I miss the utility DRK had with AoE pulls, specifically the Abyssal Drain spam, but I do not miss Dark Arts one bit.

I don't think DRK needs all that much work tbh, I think it just needs a burst window that's more interesting than Bloodpsiller spam, something else to sustain itself like a HP absorb with Blood Weapon along with MP or reducing the CD on Abyssal Drain or maybe charges of Abyssal Drain, and a buff or rework of Living Dead.