I have to confess, this limit break worries me a great deal. I managed to handle all the others that have come up but seeing as all the shouts I've seen are for a summoner with alexander or four beastmasters, I can't help but feel like im going to struggle to get this done.

I agree with the notion about how this is only going to get harder with time too. I know the answer most people are pointing out is "go and find people who have already done it to help you!" but realisitcally, how many people do you think are going to go back to help someone they don't know? In my general experience, people who have cleared a battlefield are highly unlikely to turn around and go back and do it again for fun.