Counter-heroes in duel mode (3.1).

Marbas tactics: the formation must be correct, specifically, the demonesses hide behind the Lords and Demons, imps are placed between two Devils, dogs are on the other flank from the demonesses, and another Devil should not stand directly next to the Lords, but one cell away.
Everyone stands in defense. When Necromancers approach the Demons, Marbas simply burns them with fireballs (after that, the demonesses (if not in berserk mode) shoot the charred ones). When they get close, we place "mangals" right in front of the Devils and Lords, and that's it.