Then, regarding Markel. I think the scriptwriters introduced him not only because they wanted to allow players to play as necromancers. He (Markel) seems somewhat superfluous, because, as I understand it, Kha-Beleth made his "investment" in Isabel at her birth. So, Markel disrupted his plans. And also - Agrail kills Nicholas, and before he dies, he demands that Godric swear that he will obey Isabel as queen, since there is no heir left. What prevented Agrail (specifically Agrail, not Railag) from waiting for a proper heir to appear, who, according to Kha-Beleth's plan, would become the Messiah of Evil? After all, Agrail is coming to Tier for this very answer. He doesn't know about the Messiah before killing Nicholas.
I know about "Lords of the Realm," but I can't buy it yet. I'm stuck on the first mission of the Dark Elves in "Lords of the North."