The most powerful hero of the Dungeon faction.

It's hard to argue with these points; you certainly deserve your nickname. I wouldn't have thought of the option with Divine Punishment, the Amulet of Fen (does it enhance Divine Punishment, and do the elements work?), and a Lucky Sorcerer.
Regarding Lethos and the Orcs, there's no question; poisoning will be the most effective way to reduce their Rage.
As for the Demon, I still think Iranna is debatable. The Horses have an initiative of 16; they might go first and attack the Furies.
Chaos can still be boosted even in the late game; I think it's possible to reach 20k damage with the most ideal setup.