"Legend decrees that if Champions grow powerful enough to challenge the demon hordes, they are brought to a corner of the Void to fight to the death. This eliminates the need for Drall to deal with them himself, while keeping the hordes entertained"
"When playing online, receive 2 gems every time you win a match and 1 gem for every loss"
The players you are matched with are based on your DPS.
The Astral Arena is a multiplayer area where players fight each other. No gold, no items, no XP, just pure fighting skills. Players enter the Arena for the duration of 5 minutes. Players revive automatically after each death.
The winner is the player with the best kills/deaths ratio, and gets 2 gems as a reward. All other players get 1 gem.
There are two multiplayer modes relevant to this area only - Free-for-All and Team Deathmatch (2 teams of 3 players each).