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Hooray, I conquered it! Twice! Once without losing any units in the Castle and once with the loss of most of my ranged units in the open field. At first, I tried to complete it without killing the red units, but that was quite annoying. Then, I was too lazy to replay everything from the outpost and teleported to him, but my conscience bothered me – without logistics, I wouldn't be able to reach the Castle in one turn, and then he would come out for a walk nearby. But if you don't flit around in front of his nose, he won't attack, so you can go around and take the Castle with a subordinate. I played on Veteran difficulty, but these methods could theoretically work on Hero difficulty as well. As for the underground passage, forget it without logistics. At the beginning, I tried it without – it's probably possible, but stat boosts don't just appear on the road, and every stat point will be useful later. Besides, logistics is something that can be fixed. It's a great quest with ranged units. I only fought the blue-green units in garrisons and Castles, slowly but surely. I played with Light and Summoning magic, and I transferred Grog's defense to Darkness. Excellent battles – a lot of fun. I noticed a couple of stylistic errors in the text in the latest video, but that's just a minor detail. Thank you!
Added 19 minutes later
I also like that mentors are available exactly where they are most needed; without them, the map becomes randomly more difficult, and I personally don't like hardcore gameplay like – well, you were unlucky, that's life, figure it out as best you can – or surprises like – and suddenly a mega-barbarian materializes with protection against everything you hold dear, and you've been learning the wrong things all your life.
There's no need to talk about the plot and videos. Isabel is great, as always, that devil...