Tactics against Necromancers.

When playing against the AI, you can easily defeat any faction with any castle. But against a human player, it's different. If your opponent is a Necropolis player, you need to act more strategically. Don't rush in (they will be prepared and might even strike first, taking advantage of their numerical superiority). You need to prevent the Necromancer from creating cheap skeletons. Prepare your spells, preferably a slowing spell. At the beginning of the game, build your powerful units as quickly as possible, but don't forget to save money to buy more.