Yes, the availability of Demonologists can be very scarce. Likewise, necromancers can be hard to find too, especially early game!
I haven't tried the warrior or paladin yet but have played through mage on hard and as Zhungzi suspected in another thread, it wasn't too difficult. I'm trying to play through on impossible now with no losses and find that using a combination of Paladins, Royal Griffins, Red Dragons, Dryads, Beholders, Necromancers and Demonologists works well. However i'm level 48 now and trying to defeat some of the bosses on the lizzard island is proving quite lengthy!
Back on topic, i havent missed the trading skill at all. Early game, playing on impossible, cash is a bit of a worry but if you get some marauders, split them and use your pet dragon's find treasure ability, money can be accumulated just as quickly as in KB with the trading ability.
Later game, you'll have oodles of the stuff! There is a cool new artifact that gives you +5 intellect but -30% money from battles. I've been wearing that since level 15 and i still have over 1 million and a truckload of artifacts that can be converted to crystals if they're needed.
