It's all about saving and loading here! You catch the morale and luck bonuses, and even without them, you can defeat the Champion. Save before each attack, and that's it! Your minotaur constantly deflects the Champion's attacks, but it still deals damage. Eventually, after a certain number of attempts, it will defeat him. If it fails to deflect, no problem – just reload and try again. This works in offline mode, but it's impossible in online mode. Although, technically, it's cheating... But it's hard to catch. However, if you really want to, it's possible. Daily save file checks.