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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 first gathering Death Knights, you need to go through a labyrinth (in the center of which is a castle) and collect the King's Undead Cloak along the way. Along the way, you will often be attacked by hidden enemies in huge numbers (from 1000 and more) of various enemies. They are resurrected, and over time, the Lich (don't forget about the cloak) that results from this will become the only force of such size. The enemy is, I think, a Fortress, and the hero has a lot of Archangels.
This is the map I'm looking for; it doesn't seem to be in the standard ones.
On this map, you can gather more than 2,000,000 powerful Liches!