Hey there,
So when I was playing, something occured to me. And some people also pointed that out.
When you fight a boss like, I don’t know… specter? You get money, loot and exp then the fight is over, you can’t fight the boss anymore unless you help someone who has to go through him. Then you’d get exp but nothing else.
I’d suggest that we get a way to fight again those we’ve beaten up because loot isn’t ensured ( like spawning back the item that spawns the boss ). And I’m not talking about repeating the boss quest!
What if you want something on a boss but got nothing interesting? What about cards??
I… lost my cyclops card during a duel against a player who won 6 games in a row 
GG to you, but then what?
I can’t get an other card by farming the boss ( cards aren’t a 100% loot )? Plus, the fact that you lvl up your cards by feeding them other cards.
All these details lead me to think that there’s a way to fight again but I saw nothing like that.
If there’s already a way to do so later, then please ignore that post. If there’s nothing like that, it’d be really nice to do something about it.