Note:
- This post have spoilers about FFIV/FFXIV
- Sorry for the bad english
- if I'm wrong with some fact, please, let me know
- all quotes was from the FF wikipedia http://finalfantasy.wikia.com

I have a theory about Ascians come from moon and they are a race named Lunarians.
There are some things about Ascians that call my attention:

- "Lunarians are natural mages, and most seen know the ultimate magic, Meteor, along with a variety of other high-level spells."
All Ascians we fought have high-level magic powers (for example, that fight in ARF)

- "Long ago in the aetherial sea, Light and Darkness once existed as a single entity. But the Darkness, Zodiark, coveted power. The Light, Hyadelyn, was forced to banish Zodiark into the heavens as a moon bound, forever separated. This sundering also shattered the barriers between planes, and the world became split into thirteen pieces: each reflections of the Source."
So... my theory is Zodiark was banned to the moon and then influenciate some lunarians to helping him with the rejoining. I have a theory all ascians are lunarians, but not all lunarians are ascians. (maybe Fusoya could be a npc in FFXIV)

- because Lunar Whale and the Devil road in FFIV, Lunarian can create advanced tecnologies, what if the Allagan empire used lunarian tecnology? According with FF WIKI, they could even craft spaceships.

- The Chrysalis have symbols of a moon and a rod (could be meaningless, but why a moon and a rod?)

That was the only things I can remember now, but what people think about the Ascians and their origin?