Kent305_n
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I destroyed Inferno first and got the tome of dark magic. There is a portal on the battlefield of Orcs and Humans for this. After choosing a side, you can use the portal and reach the Sphinx. There is a quest and destruction there, but it's a yellow demon.
Another question about the Elves and Orcish Hunters: it turns out that they both give quests. I took a quest from the Elves, went to the Orcs, and they give me quests, or to kill the Druids. After that, a window appears to attack the Orcs or cancel. One of the quests will definitely fail, or is it possible to complete both?
I also don't understand about the spy Axel. I searched the whole city, and no one said anything. Only the Centaur said that this Axel told me some nonsense about a horseshoe. In short, I talked to everyone and returned to Axel, but he has no reaction.
With the Elves and Hunters, you can only complete one of the two quests.
About the spy: somewhere in the Orcish city, there is either a Shaman or a Daughter of the Sky; I don't remember exactly. She will expose the spy.