Do various adventure decks (adventure, city, highland, woodland, dungeon) have their separate dicard piles? I always played that they do but the question came up yesterday and I couldn't find anything in the rules that would suggest one way or another. The only mention is that spell deck has its own discard pile, but nothing about expansion adventure decks.
I would certainly be interesting if there was only 1 discard pile for all adventure cards. Opinions?