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I don't know if it's a bug or what, but when you defeat the "Duke of Owls" on the islands, upon returning to the governor, you can report this to him an infinite number of times and receive a certain amount of money and experience (version 1.2) =)
The "Sacrifice" spell is very useful. Take as many peasants as possible, fill the remaining slots with troops whose numbers you need to increase (for example, troops that you can no longer buy, but your leadership allows you to have more... in my case, I increased the number of cavalry from 11 to 38 and skeletons-archers from 100 to 500).
The trick is that after the battle, the increased slot does not decrease, as, for example, when using "Summon Necromancer" =)
The main thing is that the remaining troops, regardless of your sacrifice manipulations, can win the battle... therefore, it is desirable to do these manipulations in a battle with some weak enemy =)
And it is also desirable to try not to overdo it, so that the increased slot does not exceed the permissible number and does not get out of control =)
Also, in version 1.2 (it seems to have been fixed in subsequent patches), you can upgrade/tame items by dying near them. That is, you distribute your entire army to the castles, take one weak enemy, enter the item, and die there. You reappear in the central square, look in your bag - voila, the artifact is upgraded =)
And I also wanted to ask, at what level did you defeat "Eminem"? =)
Because I went to him at the very beginning... and I'm still afraid of him =))))
I'm already a level 20 mage, but I don't remember how many undead he has =)
I remember that it seemed like a LOT to me =)
Regarding resurrection: the spell in the book, in my opinion, is not necessary... it is enough to have Inquisitors in your army and the "Bless" spell =)