Depending on how fast your server kills nine tails, this event is your best bet. If it takes your server over 10 minutes to kill him, then make sure you do it every night along with using the anbu support. The more dmg you do, the more xp you get. So make sure you stay the whole fight and make a really good team to maximize your dmg output. This reason alone is why no one on S1 is 85 yet and on later servers like mine (s44) we have 85's.