Board Thread:Naruto Discussions/@comment-28861328-20140514062714/@comment-24953394-20140523235336

FYI, the sage didn't defeat anything. He had to seal the damn thing into his body. If he defeated it, it'd be dead, and no one would be bothered with it. So what did he have to do? Split it in ten different separate beings so it doesn't come back. As far as we know, you can't kill the Ten Tails.