Basically if I get a nice amount of hits in I can see his HP coming off, but I never get to more than say 5 minutes attacking him before I have to retreat to near the entrance because everyones getting KO'ed. Then once cured I come back and its HP has already regenerated to near full, and then perhaps that time fighting it KO's or near KO's everyone very quickly so I dont get to do any damage before I retreat back near the entrance.

If his HP didnt regenerate so quickly this strategy would work, needless to say it would still take a long time, but as it is, Fafnirs HP just regenerates too quickly for my attacks to make its HP slowly but surely drop.

I'm doing damage of like 3-5,000 per hit so not that brilliant.

I guess I'm probably just not quite good enough to defeat him yet, even though I've killed nearly every other level 7 mark. His HP is so huge :P

I'll gambit up a Chronos Tear for next time round rather than selecting it, I already had Sleep gambit set up etc. I'll perhaps try again when Vaan is level 70, hes currently 63.