To win you must get a warrior, cleric and tow others capable of using range(conjurer, rogue, mage or ranger) get the cleric good intellect, and all healing spells plus litany of pain, and use cleric to heal
on easy, you should all fight bosses, and using druidhs idea(First Line: Warrior Second: Conjuror, Cleric, Conjuror. 1st level boss is a little bit hard, but later it's really hard to lose. Conjurors can: summon Wargolems to the first line, Call Souls of dead allies and Banish all summoned creatures (even Human's Aetherguard). With staffs they are useful to kill Wraths, and all second line stuff. Cleric is full time doctor (with Holy Light, Purify! and Heal All). And warrior with Execute and developed Leadership quickly become killing machine)
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