The battle arena is accessible from the city page. Here, you can fight against other human
players to improve your battle rating. No gold, items, or experience will be gained from these fights; these are only
for bragging rights (which are validated by your battle rating). The arena page itself contains detailed instructions
about how to fight. You will notice that during the fight, the sidebar on the left disappears. This is to prevent
you from accidentally navigating away from the arena. If for some reason you do accidentally leave the arena, you can
reenter your current fight by clicking on the Battle Arena link on the City page.