I come across a dungeon/fort/ruin/whatever and decide to head inside. After clearing a bunch of mobs and solving a puzzle or two, I face off against what seems to be a boss. Victory, and the loot, is mine.
My question is - by exploring these dungeons, and clearing them of mobs, does this eliminate any associated quests for them? If I get to a nearby town, will they no longer give me a quest to kill the local Big Bad (just because I happen to have come across that dungeon in my wanderings)?
If so, I'm now reluctant to enter dungeons in a natural, exploratory manner for fear of reducing the number of quests (and rewards) I can compete.
Has anyone run into this?