The Reserve

Well, I finally finished the walkthrough on 6-4-1. I didn't dig up the Grail, and I didn't collect the Legion Statue because I didn't have the Head. I checked in the editor, and there is a Statue on the map, but I can't reach it because the guardian requires a hero of level 45, and all my heroes are weaker. :( Then, using "Prospector," I found out that the Head is actually located separately in one place, but not in plain sight; it's with a group of monsters. I would have had to spend another 4 days getting there, but by then, the enemies had mostly disappeared, and victory came sooner: when the last surviving enemy hero attacked my city.
But I did everything else I could: I captured all the cities, including Sky-Sky, and I got the Scroll of Dimensional Door and the Tome of Air Magic; and even though the scroll was on cursed land, and there was an antimagic garrison on the way to the Tome of Air, I suffered only minor losses.