If the primary goal is a quick and efficient fight, then I think a mage using Armageddon + Time Back is the way to go. I was able to complete the fight against Moro in just 4 turns with no losses. Of course, the downside with this is that there is no time to dig for treasures and that you tend to be empty of mana when the battle is over... Also, the strategy does not work for bosses.
Out of curiosity, has any of you managed to down Moro in fewer turns with no losses, using another strategy?
More info here:
http://forum.1cpublishing.eu/showthread.php?t=13933