Death Mountain is a limited-time building which was released on March 10, 2015 as part of the Superheroes Event 2015. It was the second prize of the event's issue 3. It re-released as a premium item on July 17, 2016, during Issue 3 of the Superheroes 2016 Event for 120 Donuts. The offer available to players that did not unlock Dr. Colossus during the Superheroes 2015 Event.