User blog comment:FauxCerf/Treehouse of Horror XXVI Event - The Third Act/@comment-93.104.176.198-20151110164339/@comment-24335865-20151110165546

But The Blameless City quest page is more explicite. You will send the 4 main kids to their 4-hours task at the campfire. When done, you'll be moved to the Sunken Temple and you'll defeat him by tapping on it 10 times.