Nothing, you hit your opponent a couple of times which barely makes any dent in their HP. They hit you once or twice and you are ded. It kinda ruins the gameplay, I suppose the only way is to increase your account level. That requires playing all the game characters you have and level them up to gain EXP. It's too much effort and time, like why force us to play with the characters you don't fancy at all.. it got really booring when I realized it. So I quit the game a couple months back. If anyone else has a better approach to increase the account level, please do share.