P.S. Regarding potions, yes - I didn't bother - I fought all the battles except the final one without this stuff :)
In the final battle, I used all the accumulated potions :)
P.P.S. By the way, I only started using Chaos magic right before the final battle, because it's impossible to win that battle without it, and before that, I fought all the battles traditionally without potions and runic magic.
As for choosing an army, I would gladly switch to Dark Elves, but the hero doesn't allow it; during the game, I sometimes had the thought that it would be good to turn the entire army into undead and re-specialize into a Necromancer, but there's nowhere to do that :(
