How to stack buffs..

I really want to know how to do this.
Ive seen somewhere that might lvl 2 stacks with attack aura lvl 2 but thats only a lil bit of extra patk, please help ^_^

Im too. my friend do it on L2Extreme. it was like 20k dmg per hit..
He didnt told me. all that i know is that is needed l2walker and u have to buff loggout and something about private storage..
if u can do this pls tell me

i tryed with ur guide but didnt worked on l2extreme

l2xtreme fixed that explot :(

=.[