The comments by Lordesat regarding antimagic and Necropolis in general were quite amusing. Apparently, I understand something about duels.
In general, Necropolis is considered a difficult race for beginners because it often requires rushing (and this isn't like Orcs where you just grab machines and go), also, there isn't such a favorite tactic for Necropolis as Lordesat likes: sitting for 3-4 months and only then fighting (or rather, here they simply lose to Humans, Dwarves, and often Mages).
By the way, despite all the assurances, there is balance in the 5th game. The difference is simply that each race has its own strategies, and some are oriented towards the late game, while others are oriented towards rushing.
P.S. And let's not forget about tactics. Against an inexperienced player, you can win battles with armies several times smaller.