"Monster", like all of Imagine Dragons' appearances on soundtracks, is a brand new song written specifically for the soundtrack, this time in collaboration with Chair Entertainment for their 2013 title, Infinity Blade III. It will be used in-game, and will be triggered during "crucial battles" within the game's engine and core gameplay. Speaking of the song, the band stated:
Chair has always been on the cutting edge of mobile gaming. Infinity Blade has been massive and we felt the song fit perfectly with the tone and visuals. We're pretty big gamers ourselves, so we couldn't be more excited.