Demon invasion.

How difficult was the battle with Kha-Beleth?

It was difficult; I had to accumulate a lot of resources for a long time to win. But while I was accumulating, Grol amassed a huge number of archdevils on the surface; there were three and a half hundred of them in total by the time of the battle with Duncan. Faydaen gave all his strong units to Duncan; he had 600 dragons and angels, but I defeated him without much difficulty with Darkness and a bunch of archdevils. Then I used the auto-battle to defeat Faydaen.

In general, I liked this mission much more than the first one; it's very interesting and hardcore. The only thing that bothers me is the randomness at the start, and the passive accumulation of resources for the battle with Kha-Beleth at the end. Maybe this battle could be made so that the player receives an army via script?

I'm posting a few replays of key battles:
1 - the very first battle on the map, breaking through the bears with starting imps; I probably replayed it 30 times:)
2 - Necromancer, reduced spells, 11 sorcery, no trident/phoenix cloak
3 - Kha-Beleth
4 - Duncan