Developing a Necromancer hero.

Without spells, the hero will be severely disadvantaged in attack and defense against all these resurrection spells, earthquakes, and so on. During sieges, Necromancers fight using magic. If the enemy doesn't have Chaos magic, there's no need to attack behind their walls. Use Darkness to disable archers, inflict plague, and the enemy will come out on their own. And it's strange that you find time for several useless earthquake spells with a 1.0 knockback, but not for a single stone skin spell with a 0.5 knockback.

Summoning is always used in conjunction with spells; if you only play with mass Darkness, they are useless.

As for skeletons... I'll probably play a few games with them, focusing on soldiers, and then I'll continue arguing, because you've really intrigued me with the advantages of skeletons))

Added after 6 hours 55 minutes
In general, I tried this build, and I don't want to anymore)).
Fortune is too fickle a mistress, and she clearly doesn't favor me, or maybe I'm just an incorrigible noob)).
Be that as it may, I'll stick to my favorite Darkness and continue to hate Imps