Conclusion: switch to TE-Lite and enable the option for upgrading troops to level 2.
I also mentioned that he found a Necromancer cloak that boosts Necromancy.
And in that game, even the birds and skeletons wouldn't have been effective if I had managed to build a Guild of Mages level 5 with a library – usually, this is done in the second week, but this time the generator gave me a "gift" in the form of a lack of crystals – and labyrinths where the mines were hidden.
Therefore, I only managed to build level 4 magic with a library by day 127.