Board Thread:Tapped Out Help/@comment-92.251.187.207-20151111094400/@comment-26818419-20151111103527

To defeat M'nthster you must get Bart, Lisa, Milhouse, and Martin to Fight him at the campfire. Each of them deals damage, but M'nthster recovers that damage after 16 hours, so you have to defeat him within that time to get him to go to the Sunken Temple.