did you read the app description? didn't you?
in advance server, users cannot recharge or bind them..
unless you really have to go to the event
and find the event named "Vanguard Coin (task)" and exchange it to "Vanguard Coin Exchange"
1 Vanguard Coin = 1 Diamond
I'm not joking here, but you have to see by yourself..
...Are we clear?
