It may be Iron Maiden’s game, but the metal legends have been willing to share the spotlight in their “Legacy of the Beast” mobile game by creating in-game collaborations with other acts. The next to take place comes with Ghost’s Papa Emeritus IV turning up this evening (Oct. 13) as part of an event called “Mascarade Diabolique.”This special event, which is taking place at 8PM ET / 5PM PT tonight (Oct. 13), will make Papa…