For the trailer, 2WEI and Edda Hayes did a cover version of the Imagine Dragons song, Warriors. The original song was written and recorded for the 2014 League of Legends World Championship.
League of Legends is an online battle arena video game developed and released by Riot Games. The game features champions that have a unique design and playstyle. The players control the champion that has to fight against other players or computer-controlled players.
Learn more about the game here.