Dominion Logo. Dominion (or League of Legends: Dominion) is a game mode in League of Legends. Champions battle in a 5v5 format on a map called the Crystal Scar. Players were able to play Dominion in a nearly complete state at GamesCom (August 17–21, 2011) in Europe and at PAX Prime (August 26–28, 2011) in North America.ominion (or League of Legends: Dominion) is a game mode in League of Legends. Champions battle in a 5v5 format on a map called the Crystal Scar.