Start-up Condition：When level 21 main missions done.
It is necessary to upgrade military rank to have more companions go fight. And you can gain reputation from arena to upgrade your military rank.
It is the fastest way to gain reputation.
There are free challenge times everyday, and you can buy extra times by gold. After one challenge, there will be a cool-down time before the next time. You can wait patiently or accelerate by gold. We will show you some players at nearly rank to challenge, you can improve your rating by beat them.
There are a few class of arena rank：
From 3 to 10
From 11 to 40
From 41 to 100
From 101 to 200
From 201 to 600
From 601 to 1000
Challenge：Players could challenge 4 other players with higher rank.
When the first player to challenge successfully comes out, all players could see his report.
Arena reward will be issued every 8 pm. The reward will be relevant to arena rank and player level.
Players will gain some universal coin and reputation when challenge succeed, and gain half serve when challenge fail.
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