Now don't start screaming right away that I don't know how to play.
I finished the first 4 missions easily, BUT THEN Ruler Erish appeared.
And that was it... I couldn't beat this mission for about 1.5 months (including restarts and leveling up various skills).
In the end, I radically reconsidered my tactics and finally killed Godric's army.
But what a surprise and swearing there was when the angels and their lot arrived.
And finally, with mass plague and raising the dead, I actually won.
Today I only finished the second mission for the mages.
Ever since I found your useful forum, I read the same Walkthroughs for missions every time and avoid many bugs.
And the easiest campaign was for the Dark Elves. Finished it in a snap.