All re. MSQ
Re. 'Zenos the Elezen'... while not particularly important, it's also possible he's either possessed a Garlean or *has* somewhat transformed his host into his old self. All we've actually seen is that he's wearing a hood with Elezen ear-flaps stitched into it, and the 'beak' of the griffin design hides whether he might have a visble third eye.

Originally Posted by
Cilia
Shadowhunter:
How has he been killing Overlords? How did he get from Eorzea to the Burn? Unknown, but I suspect those questions will be answered in time. He may just be killing the hosts; they need to use their Dark Crystals to return to the interstitial world between dimensions; if they're stopped from using them as Thordan did that's not an out, and if there is a way to prevent the possession of a living person they're no more invincible than the black masks.

Originally Posted by
Alleo
I think one could identify them thanks to the black crystal. Thancred was wearing one and they need it to bind them to their hosts. Even Minfilia seems to have such a crystal but a white one. (I hope I remember that correctly)
I'd have to find the cutscenes where it's explained, but I thought the crystals were for, as Alleo said, binding the Ascian to their host and not their power source for returning to the world between.
If I remember correctly, the crystal Minfilia had was just a replica.

Originally Posted by
Chewy2nd
re: Shadowhunter
Is it possible he possess' the Heart of Sabik still? He could have took it from the remains of the Ultima Weapon, given that it is an ancient relic of unknown origin, perhaps it can hold Ascian souls, like the Eyes of the first brood
That's a really interesting idea! It seems a lot more plausible than "he's just that powerful", which seems out of scale with what we've seen so far.

Originally Posted by
YianKutku
I'm imagining an alternate what-if scenario where Yotsuyu refused to give into her despair, so Asahi keeps following her everywhere and needling her, except he keeps getting interrupted by the big Garlean magitek transport also following them around carrying all these crates of crystals just in case.
Hahaha, I like that mental image! I could picture it as a comic. And the increasingly frustrated faces he'd be making as it failed every time.

Originally Posted by
YianKutku
Technically Unukalhai. Of course, Unukalhai's mask looks nothing like the usual Ascian mask, so your point stands.
Is Unukalhai technically an Ascian though? I was of the impression that he's something like one, but not quite, and perhaps a unique case.

Originally Posted by
YianKutku
I'm also curious why Gaius chose here and now to show himself as Shadowhunter. He must have had some way of obtaining information (especially since his spymaster Nero is now working with us), since he was obviously waiting in the middle of the Burn (a huge desolate region with nothing of interest and much danger) at exactly the same time and place as the airship with Alphinaud to get shot down and attacked by the Royal Guard. This was obviously planned, but how is the question.
I didn't get the impression that it was planned - Shadowhunter's part in it anyway. They could have been nearby (doing whatever it is that Ascian-hunters do in an aetherial wasteland) and seen the ship go down? Or even have a camp in the area. If I'm remembering the earlier lore reference right, I think there are tunnel-caves from giant sandworms? As pictured on the world map. I hope I'm not pulling this out of nowhere. Will try to find quotes. May edit this later.
In any case, he's completely unwilling to tell the others his actual identity, so it doesn't seem like he's "choosing" to show himself here, so much as he came to some people's rescue and it turns out that one is his ex-enemy.
(I wouldn't be at all surprised if Alphinaud works out that it's Gaius, sooner or later, and tactfully doesn't actually ask about it.)
On the other hand, the airship getting attacked in the first place is most likely part of Elidibus's scheme. Kill some inconvenient enemies and blame the attack on the Domans - shooting down a peaceful Garlean ship carrying ambassadors and the prisoners they had just released? What savages! This calls for retaliation!