Arena

The arena is a place where you can battle other players teams for rewards. Each rank gives a reward when you reach the rank for the first time. the arena battles are automatically fought and can end totally random. The bb isn't necessarily used when your units reach full bb gauge and the prioritization of your units will vary alot. Sometimes your units will effectively rid an enemy team whilst other times your team may not be able to set a real focus and get destroyed by the opponent.