The map is cool; I completed it on the hard difficulty level in no time...
How did I know that only the Necropolis faction has the ability to recruit neutral undead units on the map (and there are entire legions of them) – for example, you approach and recruit 7 Twilight Dragons with skeletons and zombies, 10-30 units each.
In the first week, there were 1700 skeletons and 800 purple spirits (located to the left of the castle).
And besides that, there were some glitches, but the map creator did an excellent job overall!!!