I apparently have done it AGAIN, I previously beaten the game with 5, then only 4, and now only a hero and 3 troops to use, jeez it was kinda hard, but manageable!
For 12-6, 1 set of elite hobbits to time the summon to do a twin diablo and not a pitlord. After that, do white tigers to kill twin diablos, then spam till you got 20-30 phantoms under the boss. Then spam in elite hobbits to do the cleanup here. The idea here is that the phantoms prevent the shadow gobs from doing anything, but allow your elite hobbits to kill the boss very easily only lv865 and took 5m in game!
 "Epic War 5"){kind=icon}
 "EpicWar Saga"){kind=icon}