I never played competetavly in .09, so I'm not sure if I'm right. YOu know how putting an eth rune in an item gives -25% to target defence? Well, the eth bug made it so that the -25% turned into -100%.
I think.... Never cared to look into it.
Oh yea. I just used an FBB back then. I think that was Jah Gul Eth, but I don't remember how it worked. My barb owned some major ass, though.