SlavaF.
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The thing is, I didn't give the artifacts to Wolfenstein in mission 3. I didn't realize it. I'll have to replay it; the saves have already been overwritten.
By the way, I finally managed to stop the gnome! I kept clicking on his icon, and it worked. I got him out of the dungeon, gave him everything Zehir needed, but... now he can't enter the dungeon; it's quite a nuisance. Two enemy heroes are wandering around on the surface, and they have eternity ahead of them. :)
So, I'll have to replay the third mission.