King's Bounty: The Legend

I breezed through the game on Normal difficulty as a Mage; feel free to ask your questions.

I've already said that the biggest problem at the beginning is the actual lack of Wrath for using elementals. I spend two rounds building up Wrath to unleash Slaim's "spit" attack. I just can't imagine how to complete the game without Wrath, which is only available to the Warrior class – it will be impossible to use Wrath elementals.

Fight more, gain more experience. The Marshlands are a treasure trove of experience (many quests) and useful items. The only downside is that you won't be able to capture the Necropolis Castle, but otherwise, everything is good there.

I am fighting, defeating everyone I can, and I can win against enemies ranging from weak to strong, but "very strong" enemies are already beyond my capabilities. I can buy more huge losses, but it's very frustrating that I only get a pittance for it (now I get at least 300 experience per battle). Bill barely made it to level ten, and I really miss Lina's and Reaper's Wrath elementals.

Now, I've moved on to the Eastern Islands; here are the results of my progress through the previous locations:
-Greenwood - 90%
-Arlania - 80%
-Ver...ber...lon Forest - 75%
-Marshlands - 50%
-Western Islands - 80%
I think I'll explore the Eastern Islands a bit more, then return to the Western Islands, and after that, with my increased strength, I'll finish everything on Darien. And then I'll put all my efforts into the main royal quest :). However, I'm concerned that I've accomplished so little in 8 game days! Or is it still a decent result?

By the way, I read somewhere that it's possible to change the game so that, when attacking enemies, the damage displayed is not in units of damage, but in the number of soldiers killed. Can you tell me how to do this?