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Here, the tactics are for a game against a human player, not against the AI. I can beat the AI without building troops in the Castle beyond level 2.
But against a human, you'll end up facing 4-5 thousand skeletons by the time of the final battle, and you'll quickly lose.
Added after 6 minutes
You kill all the skeletons (10,000+ damage) with 3 stacks?
Even if you do, then a massive attack will follow. And a strike against you with the same number of Angels, Wyverns + Black Knights. + Vampire Lords. (+ a counter-attack of skeletons against the Angels). This also means 10,000 damage, and if you subtract the Dragons, the onslaught will be double, i.e., 20,000+ damage. Will there be a fight after that?
Added after 6 minutes
Don't Necromancers have any tactics?
Well, that's 5 points! I'm laughing:D
The main thing is not to rush!! Heh-heh:D
And why rush? If you have good stats, it's better to upgrade neutral monsters; you might take a second Castle, and then 4,000 skeletons won't be scary, but you shouldn't drag it out until the 3rd month, or he'll collect some good artifacts