Talk:Nameless Terror/@comment-26412103-20190507125141/@comment-24634511-20190507150057

..when you open the menu and go to "Quests" there's a tab for completed/failed quests - it should be here if failed - the failed ones are always marked in red..

But yes - the quest becomes unavailable The Final Battle is started (I think the Final Battle is an exception to the rule that failing quests results in a notification)