Ranger – “Emerald” [5th campaign, 2nd mission]

I read the beginning of the walkthrough on Hugo's Corner. It completely matched my thoughts. I'll try it tonight. So, I think capturing the middle castle in the second week is a mistake (there are no enemy Heroes there, only a waste of precious time, because you also need to return to your home castle, get in the boat, and sail to the upper Inferno, and by that time, Alastor will be level 13 and already have a decent army). It's better to capture the mine, get in the boat, and sail to 112. The Heroes of the upper Inferno are killed without much difficulty. Besides, you get a dragon and an increase in demons. Then, we place our flags over unguarded mines with auxiliary Heroes, and we put Faydaen in the boat and sail back to break through the pit lords with the elven castle and capture the middle castle. I haven't figured out what to do next.

Added 7 minutes later
And Chaos for the Elves is not the best option, but they didn't give me Light :) Although, when the armies are small, it helps a lot.