Mysterious monsters without much explanation?

[JeanneOrnitier]

We still don't know where Ultima came from beyond that Ajora called her from another realm. Is she a space alien like Omega and Midgardsormr? Is she something summoned from one of the shards? Somewhere else beyond the rift?

Gigants? I'm not sure if we saw any in Elpis or not; regardless, we definitely still don't know why they worship Crystal Tower.

We don't actually know where most of the beast tribes come from either, though a lot of the ARR ones existing on multiple shards means they were pre-sundering so are probably Ancient creations. But I think the only one we know for a solid fact is Ixal being Allagan chimeras.

[RyuDragnier]

We still don't know where Ultima came from beyond that Ajora called her from another realm. Is she a space alien like Omega and Midgardsormr? Is she something summoned from one of the shards? Somewhere else beyond the rift?

My personal headcanon is that Ultima's a shard of the Ascian Altima who went out of control, and the WoL of that time was the one who sealed her away originally.