Any suggestions for involving everyone in the finale fight?

What about doubling the Ringwraith's stats for 2 heroes and trippling it for 3 then taking turns to combat? Hero 1 - Minion, Hero 2 - Minion etc. Next Card effects etc affect the next player.

That way you can have a nice party fight.

Think this could work?

Option 1: The Nazgul fight all heroes, but not at once, but in turns. Then you just count the number of victories.

Option 2: The heroes still choose a champion. Then they make a common pool of cards which will be the champion's hand for the combat. For example Thalin is the chosen champion. He has 5 fortitude. He builds his hand from his cards, and other heroes...

Neither has been tested, just ideas off the top of my head