I'm going to choose the idea that nobody exept us know its location.
Its the most logical one I think.
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I hope for Exdeath. Master of the void.
There is no running from the void, only, DEATH. - Exdeath
I wonder if they'd just blatantly go with ExDeath... For starters, Crystal Tower and its homage to FFIII was meant to be an exception, not the rule, so having ExDeath show up would kinda go against that? It's not quite a retelling of FFVs plot, but it is very Void-centric, so having ExDeath walk in might be pushing that a bit much...
Then there is the name... ExDeath? There is a reason FFXII went with Exodus instead... Given we've had CĂșchulainn in Void Ark, seeing Exodus as the penultimate boss could work...
The (seemingly) final boss of this next arc looked reminded my a lot of Bloodborne's Moon Presence boss due to howit descends from the sky and appears to have tentacles.
At 1st I thought it was holding a scythe and that it was an upgraded/transformed Fediad, but who knows? Ferdiad, like Cu Calain, was a figure in Irish Mythology and was a student of Scathac. Additionally, it's been confirmed in his TT that was was summoned by the Mhach during the War of Magi and was subsequently sealed by the Amdapori mages in their Keep
I prefer if they save ExDeath for something like Gilgamesh's continue story in FF14. SE has yet to explain how Gilgamesh becomes FFVIII Gilgamesh which is Gilgamesh's Oldest self where he has already obtained Excalibur but has lost 3 of his right arms.
http://vignette2.wikia.nocookie.net/...41&format=webp
Those 3 fake cardboard box arms sound like something Hildibrand and Natsu would give him if he lost his arms.
GREG can shapeshift to have up to 8 arms. Varies from entry. VIII is likely after his battle with Necrophobe.
Greg's timeline also varies due to the Void sending to different places at different time and space.
Of course Greg's origins begins in Final Fantasy Type-0 which is where he developed his weapon collecting habit and began traveling the void.
Going through Greg's origins in Type-0 is still sad as he lost everything, his best friend Enkidu (died protecting Gilgamesh that lead to him to lose his memories), his kingdom, the people he cared about, and his memories, before he became the comedy character we know him as now. Despite losing his memory he still remember the name Enkidu despite not knowing why he values that name which lead to him naming the Void creature he meet in the Void to be Enkidu we know as Gilgamesh's companion.
I'm a big FF GILGAMESH nut. And in here barring Ramuh, Enkidu in XIV was one of the few benevolent Primals. And it only took the belief of GILGAMESH himself to make him appear with a bunch of Fire Crystals. In Type 0 though he eventually remembers everything. A first for L'cie/WoL in that game's world but I think he just keeps his past to himself since other worlds can't really relate to his loss and his comedic nature is really just a mask he wears to hide his "greatest failure".
It's stressed in a lot of FF games that "he looked like a monster but didn't seem evil".