I also have very little confidence that you will encounter a mentor in a game against a human player.

I very rarely play standard maps, where a mentor appears only once in a million tries :) and I play on Hamachi, EasyVPN, and similar platforms, and in maps like Absolute Power (10 cities), where each castle has a mentor.

because killing him in the castle is problematic in any case and only possible with a significant advantage, otherwise you need to try to catch him in the field.

But what about super-fast demons? They will run out on horses with Cerberuses/Hellhounds faster than our Executioners/Warlords? And thank you for the 5th skill; I chose Logistics and Death Stride (+4, I didn't notice it right away because I was actually aiming for Education with Wrath of Fire).