Several hikers have returned from up the mountain, reporting that they'd found "strange doors" blocking their path. According to the description they gave, it sounds like the doors can only be opened if one, or more, of the heroes make the climb up the mountain. The cracks go up past the doors, but there's an invisible wall all around the area that stops them from ascending any further. Whatever's going on up the mountain will need some heroic intervention to figure out. Good luck, heroes!