Yup there is ! Dunedain Cache (from the Dead Marshes). In fact, in a 4 player game, it really saved our hides in Conflict at the Carrock. We pumped Gimli so much with attack strenght that he killed nearly all the trolls alone in a single combat phase, even though they were all engaged with different players. Granted, we had all the right cards at the right time, and we all had specialized (one-ressource) decks. The things you can do with an Erebor Lorekeeper, Common Cause, Westfold Horse-breaker and Ever vigilant...Wham ! :-p
It might seem to make the game ''easier'', but hey, it took use many ressources and four cards to make it happen, so it doesn't happen in every game. There is a cost to such awesomeness :-p And some quests are harder in multiplayer...Rhosgobel becomes a nightmare...with 3 or 4 cards revealed the odds of drawing treachery cards rises dramatically, and the capacity to cancel them all decreases. So it all depends on the quest, really.