Having finally done this last night and gotten my Crown, Ring and Flag I just wanted to add some few tips.
The last 'Boss' you have to fight is light based and spams things continually. It doesn't move far although you can drag it a little way from where it starts. It has a long draw in range if you have hate.
You can reraise during the fight as long as you're not too close and it doesn't regen.
It spams an AoE move on whoever has hate as well as casting Tier III light spells and things like 'Mega Holy'. The AoE move has a magical defense down added effect and you want to remove that on your tank.
The way we did it was with PLD. We found it far easier, we tried with NIN and them wearing % damage down gear (which helped) but almost everything goes through shadows.
We had our tank stand to one side, spamming voke, flash, cures etc to keep hate on them. That meant the AoE was targetted on them and as long as other people didn't grab hate, they were free to attack it without getting hurt except by things like Diaga III. The tank doesn't have to stand on top of it to keep hate, have them stand to one side at max distance and just spam hate tools. Keep everyone else away from the tank, have mages at casting range for cures but out of AOE.
We found we needed a hell of a lot of 'fresh so went with BRD + RDM. The RDM was /WHM and main healer. We'd gone with WHM + NIN but NIN empties your MP pool v fast, and I (was WHM ended up SMN) have good gear and MP merits.
SMN is awesome for the Megaboss. It can just keep summoning Diabolos and spamming Nether Blast. Garuda is useful for the prefight against the BLU - but Diabolos better for final mob. Also a SMN can keep spamming stoneskin and erases on peeps.
We didn't miss having a WHM when we did it, RDM/WHM simply converted and we had BRD + RDM so loads of refresh.
We had a SAM and a BLM. BLM was free to gently nuke throughout, but don't pull hate, much simpler with a PLD tank. Blizzard works well. I'd suggest /WHM for this too. Keep DoTs on the Megaboss, he doesn't regen if you wipe and you can continue on - but the Dots will help eat away whilst you recover a bit.
SAM is pretty nice in here as long as they're not stupid. If you pull hate as a DD make sure you're attacking nowhere near the mages so they don't get spammed with AoE damage. As SMN the only time I really got hit with anything is when I ran in to use Earthen Ward.
There will be death but there is no XP loss and the fight is pretty fun. It takes a while to get the hang of it. You want the first section over and done with ASAP because the Megaboss is tough and takes a long time to chip down. I'd say for an everage group you'd need 20-25 mins for the boss. So if you're struggling with the first sections, HP, get a new key item and come back and start over.
Our final winning setup was: PLD, SAM, SMN, RDM/WHM, BRD, BLM/WHM.
Bring lots of Reraise
Super fun fight - if not frustrating...
1) Fight against a BLU who reraises twice, you fight him 3 times in total and he spams 'Eyes on Me' and uses his 2 hr each time he reraises. It can do over 1600 damage on a single target if cast with 2 hr but it can be stunned. His Seraph Blade attack can be nasty too. His final form can be resistant to magic or melee or ranged depending on how the previous 2 rounds have gone. SMN and BLU are nice.
2) Fight against an 'armour' style mob controlled by someone else. V easy, doesn't need tanking really if your tank is weak. Get it to around 50% and it gives up.
3) Fight against Megaboss. (allow at least 20 mins for this, more if poss cos you'll prolly have people recovering at points) and he has a hell of a lot of HP.
CS after is a tearjerker - story is lovely and the cs back in Whitegate are awesome too. Definitely ends on a high note.
Your reward is a conquest flag for Aht Urghan (like the rank 10 nation ones), your choice of three rings and your Glory Crown back, signed from Naja.
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