Samurai Persistence

Because you need to look at the theme of the "Invasion from the Underworld" campaign, not the map itself. Yes, this is the fourth mission of the campaign, not a standalone map. Master usually created such themes as he developed the campaign, and the need for them disappeared with the full release.

And yes, this campaign is one of the most difficult, if not the most difficult, in the community. Master's name has long become a household name because of the hardcore nature of his work.

Thank you for the answer, and yes... I bet that the author himself didn't complete this map in Heroes! Fact! Unless he stretches it out over several years and removes the author's cheats. But why create such maps? It's a mockery of players. It's like giving someone a knife and telling them to stab a tank. Nonsense, not a scenario - let the author confirm the playability and completion of the uploaded map in Heroes!
P.S. I have completed Master's maps, even on EWA (now, due to compatibility issues, I play on the classic version). No matter how difficult the previous ones were, I managed to finish them by working together. This mission is meaningless and merciless, like a Russian riot.
P.P.S. I'm finishing a similarly meaningless one by Tenebris now and will write about it... it seems the author also overdid it. As veterans, you should filter out such works or require confirmation of the playability of the uploaded content... I don't think anyone wants to waste time on all sorts of dead ends.