Obi
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Let's get back to the battle against the champions on the Obi map. Are we even talking about the same thing? The main goal, actually, is to survive the champions' second turn, and that's where the problem lies (let's set aside the issue of standing behind a single wall). If you can survive the second turn (and you'll likely lose 2 stacks in the process), then it will be easier. This is the state that we couldn't achieve after trying hundreds of variations. And that's why this battle, along with the map, is starting to annoy me. Sorry, are there really not that many variations?
Just for the option with a single stack of Faeries, there are 70 possible hexes for the initial placement on the tactics map. And about 30 hexes for the placement of the first wall, and the champions' behavior can differ depending on the wall's position. That's already 2100 possible actions before the champions' first turn. On the second turn, there are even more action + wall placement options, but if we remove the obviously unnecessary ones, there are logically useful ones (where the second wall is next to the first) where at least the first stack doesn't kill you, let's say about 10 options. In total, we get over 20,000 possible actions that could potentially allow you to survive the 2nd round. But that's not a certainty.
After all, there's also the option of removing +1 speed (we match the speed of the 1st stack) and acting through wait - that's also several thousand options.
And there's also the option of splitting into 2 stacks. That's no longer 70 placement options on the tactics map, but 70*69=4930, and the number of action variations over two turns is already around 1.4 million.
And with all this variety of options, the hint for the first 2 turns is "don't use more than 13 walls," when the real problem is how to even survive long enough to be able to place the 3rd wall? This seems inadequate.
There's a cognitive bias called something like "the curse of knowledge." When someone knows something, they may perceive something as obvious to others.
I'm very glad if you were able to quickly find the right solution for the first 2 turns, but you're wrongly ignoring the space of empty options 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 options. But, unfortunately, it seems my intuition failed me. And exploring other tens of thousands of options, I don't consider it an interesting or even somehow justified task.