Ragnarök: Ash Vacuum is a role-playing strategy game for mobile devices in which you can build towns and level characters. It is the successor to Ragnarok: Guild Masters, which closed down 2013 March. Ragnarök: Ash Vacuum was first launched in South Korea on 2013 October 24. The name was later changed to Ragnarok Empire in an update on 2014 December 19. The Korean original version eventually shut down on 2015 April 3, having only been in service for about a year and a half. The North American release shut down a few months after on 2015 August 25.