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I'm looking for a map (unfortunately, I can't remember the name).
You play as Necropolis, and in the castle, you can only buy Death Knights. There are several buildings near the castle where you can buy more of them. Nearby, there's a dungeon with a hero who has the Necromancy skill. Using this hero, after gathering Death Knights, you need to navigate a labyrinth (with a castle in the center) and collect the King of the Undead's cloak along the way. Along the path, you will often be attacked by hidden enemies in huge numbers (1000 or more) of various types. They are resurrected, and over time, the Lich (don't forget about the cloak) that results from this process will become the only force of that magnitude. The enemy seems to be a Fortress, and the hero has a lot of Archangels.
That's the map I'm looking for; it doesn't seem to be in the standard ones.