As far as I know, this is the best place to identify your Ancient Stone! How you pass a difficulty 12 intellect test on scenario 2 (which doesn't even have any clues on it, so you're truly just swinging for the fences) is left as an exercise for the reader.
Check your supplies. If you have the Key of Eztli: Search the exploration deck and all set-aside cards for Chamber of Time and put it into play. If it is act 1a, skip directly to act 2a. For the remainder of this act, Sealed Passage is connected to Chamber of Time and vice versa. (Group limit once per game.)