Even if you manage to set everything up and buy everything, as a rule, on the 2nd week, you need to take the cons, the clues (and there's strong protection there), but who will take them? 5 knights are powerful, but... there are very few liches, and zombies are just weak.
Without Gosh, the skeletons will die like flies.
It often happens that necromancy doesn't level up, and you can't gather much with just 10%.
I see the alternative to banning Gosh only in the necromancy enhancer and upgrading vampires, and of course, banning Isra and Vidomina, because with the enhancer, they become overpowered. Then, losing the leader won't be so terrible, but who would do that?
Primus inter pares