Need Big help with Fafnir Hunt

I have every ability under the sun and ALL characters are level 75 but i just cant beat this (enter expletive here) any hints please!!!!!

Fafnir… The first time that motherfucker took me forever, it was embarrassing I was even blowing Megalixirs towards the end cause I didn’t wanna sit through it again. But on my second playthrough I found a really semi-cheap strategy that actually WORKS! This isn’t my video, but I did it myself and it worked.

http://www.youtube.com/watch?v=qkkKHGqvCCc&feature=related

Do it.

Yeah, I did that too, on my second run. The first time he was a right pain in the arse – I’d resorted to running round in little circles behind a rock where he couldn’t see me, to try and gain MP, then run out and throw a Thundaga at him, before hiding again.

I’ll give that a go, that Elder Wyrn big 8 million HP guy was EASY compared to this, thanks for the tips.