Walkthroughs for custom maps.

Returning to the battle against the champions on the Obi map:

the main thing in this battle is to find a configuration in which 4 out of 7 stacks of champions die within the first 5 turns; after that, everything becomes much easier.

Are we even talking about the same thing? The main thing, actually, is to survive the champions' second turn, and that's where the problem lies (let's set aside the issue of standing behind one wall). If you survive the second turn (and most likely, 2 stacks will be lost), then it will be easier. This is the state that could not be achieved after trying hundreds of variations. And that's why this battle, along with the map, starts to become very annoying.

But, in my opinion, if you find the right moves in the initial rounds (there aren't that many variations), then everything goes normally.

Excuse me, there aren't that many variations? For the option with one stack of fey, we have 70 possible hexes for the placement in the first turn on the tactical map. And about 30 hexes for the placement of the first wall, and the behavior of the champions can differ depending on the position of the wall. This is already 2100 action variations before the champions' first turn. In the second turn, there are even more action + wall placement variations, but if we remove the obviously unnecessary ones, then logically useful ones (where the second wall is next to the first) and at least the first stack doesn't kill you, there will be about 10 variations. In total, we get over 20,000 action variations that will likely allow you to survive the 2nd round. But that's not a certainty. After all, there is also the option of removing +1 speed (we become equal in speed to the 1st stack) and taking actions through wait - this is also several thousand variations. And there is also the option of splitting into 2 stacks. This is no longer 70 placement variations on the tactical map, but 70*69=4930, and the variations of actions in two turns are already about 1.4 million. And with all this variety of options, the only hint for the first 2 turns is "don't spend more than 13 walls," when the actual problem is how to at least survive until you can place the 3rd wall? This seems inadequate. There is a cognitive bias called something like "the curse of knowledge." When knowing something, a person may perceive something as obvious to others. I am very glad if you were able to quickly find the right solution for at least the first 2 turns, but you are wrongly not taking into account the space of empty variations that others have to dig through, while you were lucky enough not to get stuck in it. I would understand if the solution was found in at least the first few hundred most obvious variations. But, alas, it seems that I was not lucky with my intuition. And exploring other tens of thousands of variations, I do not consider an interesting or even somehow justified task.