I just put together a complete set for the Dwarf, got a ring with +20% to initiative, the Staff of the Underworld, and the Cloak of Deathshade. My skills are: Fire Protection with Blessing, Stone Skin with Solid Defense, Master of Curses, Spellcasting, and Rooster. I just stood in defense and blasted everyone with mass spells, occasionally charming Archdevils. It turned out to be quite easy to defeat Dominion with this setup. Before that, I tried playing a build focused on Readiness, as well as another strategy with summoning a phoenix to block my creatures and Banish, which deals ... 2 damage.
To prevent Irbet from taking over all my cities, I just chased her around the map with caravans, and then we met in the first city of the League, right after the garrison. I finished it in about 3 months and 3 weeks.
I also want to thank you for such a high-quality scenario. The map looks very beautiful, especially the cliff where the Tome of Chaos lies. I would really like to see more of your work!
p.s. And I didn't complete the additional quests)
My second work is the scenario "Fallen Knight," a map that was probably the most buggy map in the history of the forum at release