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Take Orson, level up his attack (until he gets the spell for speed), defense (Grave Chill), Luck (Soldier's Luck), and Darkness (fully). If you get Berserk and Subjugate, you're in luck; with proper use, you'll win 90% of the time. If you also get Confusion, it's 95%, because there are no counterattacks. On the battlefield, first use Confusion, and then either subjugate the Knights/Angels/Zealots or place Berserk. This way, they essentially kill each other, and you can stand in defense and slowly whittle them down. Another option is Deidra; it's similar, but you need to try to collect the Vampire Armor set and go to the Sanctuary. Then you'll get good attack and luck, around -3 to -5, and you can finish them off easily, but I'd recommend Orson more; it's easier with him.