Tactics against Necromancers.

What is the strength of vampires, brother? Their strength lies in their numbers! When their numbers decrease, their strength diminishes significantly (fewer opportunities for regeneration). Most units of levels 4-5 can successfully withstand a SMALL number of vampire lords, but when there are a lot of them, it becomes problematic. Magic that deals direct damage works great against liches – they don't have much health! Death Knights are a problem. A serious one. But dragons aren't that scary – practically any level 7 unit can tear them apart, and even a level 6 unit (with a numerical advantage) can give them a serious beating.