Dimension Door, get the Medal of Vulnerability and create skeletons!!! Finish off the rest while they're standing there! And if they wake up, hit them with Berserk so they slaughter their own. When only the skeletons are left, blast them with Lightning, and move around the map with your warriors. As a last resort, you could try Chain Lightning+Mirror, but that's wild and macro-risky.
P.S. I remember Alan saying in chat that such a medal is hard to get, but that's not true; it's found often in the Dragon Utopia. Also, I can create skeletons, but I can't cast Berserk.

Best regards Uke-by_petek!!!