By Quetzalcoatl.Trauma 2011-08-03 15:34:10
My group often did this with 4-5 SMNs, a COR or two, and other random jobs including a NIN sub RDM puller. Our NIN would pull to the bottom of the stairs where we would kill the first one and immediately run to the broken stairs on the opposite side. This was just to be sure we wouldn't aggro any stray wyverns, or the boss if he decided to move.
When fighting the wyverns, make sure nobody stands in front of them. Radiant Breath can often 1 shot players. The paralyga move they do has a radius of about 15.0, so mages and anyone trying to avoid paralyze should be standing back. If by chance the boss does come, he will usually sit in one spot (where you killed a wyvern) and not move again after that.
After killing all the wyverns, have someone grab the hydra and start kiting around the fountain. You can have all your pet jobs get on it once it is near the fountain. Ranged attacks work nicely against him as well and he's fairly slow, so kiting around the fountain isn't a problem. Quick Draw and Ninja Magic are also fairly good ways to deal damage.
Things to watch out for when fighting the boss are his physical and magical shields, which last about 1-2 minutes each. His worst move is Barofield. It's an AOE that hits anyone around the player it was used on. Barofield deals moderate damage and inflicts a very nasty gravity. He also likes to cast Silencega so make sure to have some Echo Drops ready if you're a caster.
If things get wild and you wipe, have someone leave the party/alliance and claim the hydra. Anyone with 12% movement speed can easily keep him busy around the fountain. I had no problems kiting and using Quick Draw to keep him interested.
I believe the hardest part of this fight is the wyverns. They're quick and can be annoying to pull. If your group isn't shifting to the opposite side after a kill then you can end up with more than one and that's when things start to get hairy.
Hope this helps! Good luck! :)