Wish one of the new bosses in the current alliance raid had its own theme (spoilers)

[Kaliesto]

If you want the real reason, it's because each of the Twelve is assigned to either an Astral Moon or an Umbral Moon of their element.

Byregot is the Astral moon of Lightning
Rhalgar is the Umbral moon of Lightning
Azeyma is the Astral moon of Fire
Nald'Thal is the Umbral moon of Fire
Nophica is the Astral moon of earth
Althyk is the Umbral moon of earth
Halone is that Astral moon of Ice
Menphina is the Umbral moon of ice

You can see the trend that the bosses are fought in Astral -> Umbral order within their respective elements, meaning Menphina will always be after Halone. The only outlier to this rule is Nymeia who joins Althyk, but that likely has more to do with the fact that Nymeia & Althyk are siblings and the devs thought it'd be a fun tag team fight and wanted to make room in the next raid series for a potential fight with the unnamed god. If they had switched the elements for Euphrosyne around around, then Althyk & Nymeia would have been the final boss instead following their Astral <-> Umbral order.

Following this trend, we will know we'll fight Lymlaen before we fight Oschon in the next raid.

There is a unnamed god? Maybe I forgot that detail somewhere.

[Iscah]

There is a unnamed god? Maybe I forgot that detail somewhere.

From the inscription in the Omphalos, revealed in the quests after you clear Euphrosyne and visit the monuments.

[Kaliesto]

From the inscription in the Omphalos, revealed in the quests after you clear Euphrosyne and visit the monuments.

Oh that explains it, I haven't done the after-alliance quests yet.

[RyuDragnier]

From the inscription in the Omphalos, revealed in the quests after you clear Euphrosyne and visit the monuments.

Which leaves us questioning who the last boss actually is. They could throw a curve ball shocker at us by it turning out to be Louisuix (with him turning out to have been the Sundered version of their creator), or just randomly make up a person on the spot to be the one we fight. Or maybe even having us fight their "caretaker." Middy 3.0 anybody?

[Deveryn]

Which leaves us questioning who the last boss actually is. They could throw a curve ball shocker at us by it turning out to be Louisuix (with him turning out to have been the Sundered version of their creator), or just randomly make up a person on the spot to be the one we fight. Or maybe even having us fight their "caretaker." Middy 3.0 anybody?

Overseer might be a better term. Sokles or their replacement?

[Kaliesto]

Which leaves us questioning who the last boss actually is. They could throw a curve ball shocker at us by it turning out to be Louisuix (with him turning out to have been the Sundered version of their creator), or just randomly make up a person on the spot to be the one we fight. Or maybe even having us fight their "caretaker." Middy 3.0 anybody?

Something occured to me, but Louisoix Leveilleur did not appear in The Aitiascope and he was a important character of that group!

[Iscah]

Something occured to me, but Louisoix Leveilleur did not appear in The Aitiascope and he was a important character of that group!

I have thought about that before, because it would have made more sense for him to be the final guiding spirit instead of semi-resurrecting Minfilia (as a plot element if not physically) just to send her off yet again.

I think it's quite likely that they wanted to include him, but the optional nature of the Binding Coil storyline means that his soul is still potentially stranded there in Bahamut's thrall.

I would speculate that perhaps they got as far as putting him in that role, realising they couldn't use him that way, and hastily roping in Minfilia instead – thus the seemingly unnecessary business of pulling her back again after she'd had such a final send-off in Shadowbringers with F'lhaminn's sidequest.