The Arena Eternal is an extradimensional structure created by the Vadrigar and populated with the greatest warriors in all of time and space. In order to survive there, you'll need to know a little bit about your enemies, weapons, and the environment in which you'll be fighting.
In addition to you, there are 32 computer-controlled gladiators residing in the arena. Each of them is a deadly warrior with his or her own personality and tactics. Some are tougher than others, as you'll quickly learn in battle.