Appearance/discussion of Necropolis units.

No, if you consider it from an animation perspective, this frail, greenish creature jumps forward and bites, let's say, a Titan in... wherever it can reach. And it tries to drink the lightning-infused blood from this metal thing. Firstly, it will cause a short circuit, and secondly, it won't be able to bite through it. It makes more sense with a sword – it's magical, drawing life energy is not the same as drinking blood, and it can draw it from anywhere without even piercing, plus there's an insulating wrap on the handle.