Your strategy for playing as Necropolis.

It's faster to get archers and Grand Mages up to level 3, because in the early game, there's no point in building levels 4 or 5. Also, build up to improved vampires, constructing a line along the gold mine. While troop costs aren't too high, reach the capital. In short, build in turns: gold mine, warriors, Grand Mages. Then, prioritize Archliches and Dragons as early as possible, before Messengers. Build all forts last. That's a brief overview.