Instead of heroes, you can dig pits, using the excavation bug.

Yes, I wrote about the holes in the same message.

This is a special case. The tent is like a second level of troops: the hero can come with it, or he may not. When buying, all heroes "sort of" come with three stacks, even if with one - this is visible from the number of starting moves. It takes several attempts.

I just started 25 times in a row as Jemma. On this map, she doesn't come with a tent. Apparently, this is because she doesn't have healing in her secondary skills.

I only looked at it briefly. Another option is probably possible, although it will require a lot of effort. We generate a GM4 with a clone and something non-combat. We feed the enemy hero with purchased heroes. We choose the advance wisdom upgrade for him. We give him the Castle, and the next day we attack him in the Castle. We kill the catapult and live on elements. The computer can only cast a clone, and we berserk it.
I didn't have time to check, but it looks workable.

You can simplify your cumbersome structure by merging the Water Mutator book. You won't have to generate a clone in the guild and level up his wisdom. You will only need to master water. He won't cast attack magic on the elementals. But even with a mana ratio of 600 - 600, I'm not sure if it will be enough for us and the computer. True, he may start producing water elementals :)

In general, there is only one option in two versions. I will wait for now and not post video spoilers, I will do it tomorrow. Perhaps someone else will join, as not much time has passed =)

As I understand from your words, this is an option when we attack a dungeon, and it is related to some kind of bug. The benefit of entering the dungeon may only be that the computer will drain mana. This means that it must cast something. What could it be, besides a clone? Although in two versions...

It turned out that the "forgetfulness" spell didn't work for me. Is it really possible to kill the boss without it? My 1300 archangels simply don't survive the 2nd round, only the archers destroy everyone.

If this battle can be won without forgetfulness, then we will have to look for another tactic. Archers deal a lot of damage, I remember. Maybe it is possible to get forgetfulness somewhere?

Added 6 minutes ago
RoseKavalier, I wanted to ask one question for quite a long time. Is it possible to do somehow that clone casualties won't be shown in statistics after the battle? Maybe some update for SoD SP?

Added 28 minutes ago
If there was a moat in the Castle, you could put the dragons on it and stop them with berserk. But it is unclear if there would be enough mana for berserk until the azure dragons are completely destroyed, and I'm too lazy to calculate :)

Although, how to put them on the moat is also a question.