Crystal tower raid and what comes next.

[EdwinLi]

Why not uncover the remains fo the Allagan civilization's capital city.

Make it called Zanarkand and the final boss of Zanarkand storyline is the Final Aeon.

Also have the Lore of Zanarkand explore deeper into the Allagan's involvement with how they dealt with the Primals during their era and what other weapons they may have created to fight the Primals.

PS It would be interesting if Aeons in FF14 were Allagan Summoners who chosen to fuse themselves with Primal's essence in hope of making themselves Primals to fight the Primals during the Allagan era and the Final Aeon was a Allagan Summoner named Jecht.

Other Examples are...

Magus Sisters being former Young Allagan Summoner prodigies.

Anima was a fomer Allagan Summoner who was known to be the oldest Allagan Summoner who endured countless tragedies in his life resulting in his form.

Yojimbo was a former Allagan Summoner well known for his skills with the sword but before he became this "Aeon" he had a reputation for being a legendary Sword for hire before become a Allagan Summoner.

Valefor being a former Allagan Summoner known for her beauty once and being the first Allagan Summoner to control Garuda Egi and a fully developed Garuda

Of course names will be changed like what happened in CT raid for some bosses such as Ifrit of FFX will be named Grothia and the Bahamut of FFX will be named Spathi.

And then their lore will have to be adjusted to being former Allagan Summoners as well with

Grothia was known for her Summoning skills with summoner Fire type Primals (reveal the identities of other Fire type Primals we have not encountered yet)

and Spathi as a Allagan Summoner who tried to harness the power of Bahamut and control it but ultimately failed. Make him also the create of Dalamud because he had the most knowledge about containing Bahamut's power.