Bond arena (and maybe arena) covers a lot more than your cross server. Based on when it is the time frame of bonds, it is safe to assume it's all of the server in your region since I've seen powers greater than the players on my cross server several times. Since you play on a UK server, this means all UK servers would be in Bonds. Do you know if your cross server is the strongest out of the region, if not there might be a stronger one?