If I use a spell to turn Warlock's Cave into ruins, I know that characters can't go there for new quests, but what about those that already have uncompleted quests? In a recent game, I turned Warlock's Cave into ruins while the other player had an active quest to kill an enemy, and ruled that she could not complete the quest, because there was no longer a cave to be teleported back to. This was obviously pretty important, because it prevented her from getting a talisman or opening the portal of power absent reversing the terrain effect. Did I play it right?
And as a follow-up, if she kills an enemy while the terrain card is active, and it later gets removed, does she then immediately teleport and complete the quest? Or must she kill another enemy after Warlock's Cave has been restored?
One more follow-up, I'm assuming terrain cards can't be removed using Destruction spells or similar effects?
And as a side note, terrain cards are an awesome new addition to the game! So many new possibilities, and with them a lot of rule questions.