Posts from Walkthroughs for custom maps. Auto-translated

With great difficulty and loss of archers and Death Knights, I managed to defeat him, but after capturing the castle with 10k harpies, I don't know where to go next. Taking the blue key is pointless, there's no Dragon Blood, I don't know how to kill the hero with 2100 minotaurs, and a strong Necromancer with 200 dragons will appear in a week. The Lord of Ring

I looked at this battle. I'll say this: I probably won't ever play such maps.

Haha! After thinking about it for a bit, a few minutes later I figured it out: the secret is in the "right" battlefield! Black dragons and hellhounds are all two-hex creatures, but we need one position for the harpies where enemy creatures can't reach them. And the rest can even be done on auto-battle. :D
To clarify: we don't need to fight this hero in this cell! We need to find (as was written before, how and where) a cell on the map where there is a convenient position for the harpies, where they are invulnerable.

But first, you need to defeat 1500 Red Dragons.

And after opening the blue tent, the AI will come with Titans and Rust Monsters. If it's affected by blindness, the battle won't be that difficult, but killing 250-300 Titans will be challenging.

My tactic against the Minotaur was to take a Black Dragon and Harpies, use the sands to cover the entire area, and after he runs out of mana (he has almost 2k), resurrect the Harpies and kill him. But besides the explosion, he doesn't cast anything else.

Theodore somehow managed to open the Guardian without taking the Green Tent, but even though this helped me because he lost some troops, is that how it's supposed to be?

Also, another question, to save time, I didn't take the Water Orb. Is it even needed on this map? I just haven't encountered a place where it would be useful yet.

Yes, it's a pity that I didn't guess the secret. But I remember that at least part of the battles on such maps are won precisely due to the convenient terrain of the battlefield.
Why I don't like this: because it's no longer "Heroes of Might and Magic", but "Heroes of Might and Cunning/Dexterity". If I could cast spells in this battle (at least a force field or quicksand) or if the hero had troops with a petrification effect (basilisks/medusas) and I could immobilize the Cerberuses and thus block the passage for the rest, I would still fight. But as it is, the "secret" again turns out to be that the enemy units are acting stupidly, as we need them to.
And does this guy really need to be killed right now and with this hero and these troops? I moved the heroes away and waited 2 days, and I saw that a strong Brown hero is coming from the south, but the jerk ignores this enemy and goes straight north (to my heroes).
In "Wayfarer", at least, nothing like this happens: most likely, if you maneuver, you can pass very quickly and with small troops, but "traditional" methods of destroying enemies work quite well.

Near a garrison with Mind Elemental creatures.

By the way, there are Azure Dragons near the castle, but there isn't that cage that was there at the beginning. Do you need to kill them using a force field?

I don't think I'll have enough mana to deal with the Minotaurs.