I suggested a Tavnazia endgame event about a year ago, and only 1 person liked it
Re-posting here for fun, since people might actually like it now.
Tavnazia
This endgame event is actually two separate events.
(I'm "Hiding" this stuff since it spoils a lot of stuff from several storylines; mainly Chains of Promathia.)
* The defending of Tavnazia in the past.
In this event, there are several Campaign-style battles to accomplish certain tasks to ensure certain outcomes, such as making sure Aldo escapes safely, and protecting the Tarutaru while they launch that meteor/comet, among any other possible events going on during that epic battle. (Remember when Aldo's sister was trapped by the Orcs and it seemed she was killed in the movie? We know she survived -- That was due to our actions!)
* Retaking the city from the Beastmen forces in the present.
The second Tavnazia-based event is more of a true endgame area, battling the beastman forces that currently hold Tavnazia in the present. The adventurers will be under the direction of Aldo, Rochefogne and Louverance, with the aid of their forces: the Tenshodo, the Knights Mistalle, and the "unexpected" help from Atarefaunet Remevel(?)'s "brigands", and possibly soldiers from the Tavnazian Safehold. Prishe may help out too. (there is the slight chance that the Tavnazian fomors may help as well)
Character Motivations:
Aldo seems to be the boy who escaped Tavnazia and also the man leading the huge army of adventurers back to Tavnazia in the opening movie.
Rochefogne is the rightful marquis of Tavnazia whose misguided actions cut Tavnazia off from the world.
Louverance wants to bring honor to his family's name and possibly help atone for San d'Oria's betrayal of Tavnazia (besides, he got tied up in the whole story due to Atarefaunet's actions during Chains of Promathia.
Atarefaunet wants to restore Tavnazia, and he's been gathering money and supplies ("brigands" and Mimeo Mirror blackmail) to mount a massive offensive against the beastmen.
Gilgamesh and many from Norg and Selbina are originally from Tavnazia as well, so they'd have motivation to go back or help in some way to reclaim it.)
The Event
There could be a mission-style story moving through Blueblade Fell, then unlocking each section of Tavnazia (similar to Dynamis progression requiring city wins to unlock northlands) one at a time, eventually working our way up the city hill, crossing the rock bridge to the castle. Each section should be desirable to battle through, and there should be objectives that can be accomplished alone (mission story progress), in small groups (gear-dropping NMs), and in alliances (optional Mega-bosses). These are to be open battlegrounds, not time-locked zones with only alliance-based challenges.
Motes of light from the partial unsheathing of the Lightbringer sword (perhaps the Avatar of Ragnarok in sword form) may remain in Tavnazia. Collecting these motes may help restore light to the Mothercrystals (if the energy types are compatible ... making this connection between the Lightbringer sword and the Avatar Ragnarok and the history of Olduum, Odin, Alexander and the Gordius... connects the plots all together, finally making Treasures of Aht Urhgan seem connected to the rest of the game!)
No staggering here, at least not in the ways that have been implemented in Abyssea or Dynamis.
Rewards
Since the "Light Warriors" event is about collecting Crystal Armor, this may function as the final weaponry end game event. However, this may just be another part of the "Light Warriors" event, if motes are involved here too. Crystal Shards may drop here, granting/improving traits, spells and abilities.
A crazy thought...
If Tavnazia isn't made an endgame battle zone event (this is a last resort to get it added to the game), it could be one of those all-server collective effort events, similar to the Crystal War re-enactment prior to the Wings of the Goddess release. Aldo, Rochefogne and Louverance could lead the players back to Tavnazia (the Tenshodo become the new city's spies and navy, with the Knights Mistalle as the guards and army.) In this campaign style event, all servers cooperate to defeat the forces that have taken up residence in the abandoned city of Tavnazia. A tally could be kept on each server of how many beastmen and wyrms are wiped out for some bonuses.
After the servers-wide event, Tavnazia becomes a new city - the new "Light Warrior's Capital" of the world - with:
* An airship port to: all the nation cities, Jeuno (Tenshodo port entrance), the Safehold (Sea Lion's den), passage to the other continents and to the locations for the endgame events related to restoring the light to the mothercrystals
* A boat to/from Norg and Whitegate
* An auction house
* Abyssea warps
* Magian Moogles
* etc.
One of the cave tunnels in Lufaise Meadows (maybe the tunnel near those Treants) could link to the "Blueblade Fell" zone, outside of Tavnazia, for the method of reaching it on foot.
(guards may block access to the tunnels and the airship ports unless players are far enough along in the story, especially Chains of Promathia, since the Tavnazian Safehold NPC conversations change at several points in the story talking about how they lost Tavnazia).
Other connecting zones could be previously collapsed corridors in the Phomiuna Aqueducts and the Sacrarium. They could also build a bridge from Blueblade Fell to Cape Terrigan, since the landmass was "cut off" during the war.
I'm just throwing these "alternate" ideas out there, so SE can take whatever they like and run with it.