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It's very interesting to hear about the pits and blockades.
Is it possible to see a save file before and after, or screenshots?
New here? I'm Roha — want a quick tour?
You can just download the map and try it out. It looks like this.
I don't rule out that this is an unplanned bug due to working in the extended editor or something else.
upd. You can fly over this hole using the basic fly spell.

Heroes3 code is a bit lazy, it "copies" existing hole object from map - in this case hole is made impassable.
Heroes3 code is a bit lazy, it "copies" existing hole object from map - in this case hole is made impassable.
Regarding "To Tame a Land," Valery posted a video of one of the key battles against the titans in the event.
And judging by the comments, there will be some specific puzzles where you'll need to explore quite a bit.
Thanks for the page with the description of the "The Legacy of Qun-Jin" series! I haven't tried playing it yet, but I'll get to it someday. There's also a link to a supposed Russian translation, but it's incorrect: it's the same English version.
And I'm slowly making progress in "To Tame a Land." I reached the 3rd Stronghold, cleared the surroundings, and freed Oris. And a little further on, I see the first of the author's "tricks" that makes me want to smack him: for the Seer to cast the Forgetfulness spell, which is needed to capture this Stronghold, you have to give him 1 Angel and 4 Vipers. We're getting those and other creatures right there, but you need to know about it so you don't upgrade them and lose the ones you need to give away! That's not cool!
In the video about titans, the author had an event displayed on the map directly in the game. Is this some kind of mod, or is he playing World of Xeen?
SoD_SP has a function to display events.
Please take a screenshot of this function, as I can't find it in the list of F12 functions.