Couple of things to help in the Dragon Trial event. First, when you get to floor 2 there is a way to fight all 6 bosses without changing target. Look below for where to click. Second, when you get to floor 3 and beat your dragon. DO NOT click on OK in the popup that shows up (shown below), click on either cancel or the x (pointed to below). Then click on quit in the top right corner (shown below) to not have the annoying glitch popup on server until you refresh. Hopefully this is clear to others.