Arena is the first game in the Elder Scrolls series. It was initially intended as an arena-game, a game in which you would set up a team of warriors and mages and fight other teams in different arenas in Tamriel. But soon the developers wanted to add cities in which you could buy equipment, and dungeons to raid for equipment and to train the skills of your teammates. Eventually Arena became a singleplayer RPG game (thus no teammates) in which the player could be anybody, go anywhere and basically kill anyone.