What about creating an ACTUAL Dark Knight?

[MagiusNecros]

I don't see why it have to be thrown out of the window, if the benefit you get from the sacrifice is worthy enough. (Example, paying 10% HP to get a 15~20% HP shield)
Also, what they had, and more specially what they have NOW, is FAR from what we could call useful life-stealing. It's a joke. Even the Gunbreaker's Brutal Shell is better at it.

Only time sustain was any fun IMO was HW Abyssal Drain and SB Steel Cyclone.

The funsies are gone now.