Necropolis discussions.

Necropolis is a strong faction. It's a very well-balanced city, with everything in its place. Death Knights are a good unit, but they were only present in the third game; they weren't in the other installments. And in general, the only units that remain unchanged for Necropolis are skeletons, vampires, and dragons. The rest change in different parts of the game, but these three don't. And only vampires retain the same ability – to drain energy and resurrect. (Skeletons have become archers, and dragons also change; they no longer age.)