Sorry for hijacking your thread. But here is something I wrote on a different forum that I'd like to share with the lore enthusiasts here and would love to hear from you all.
So I was thinking. The world has 12 deities and 2 supreme deities.
The 2 are light and dark, known to us as Hydaelyn and Zodiark. For the other twelve, each element has 2 deities associated with it. We know them as the Twelve. The Twelve, according to the Acsians, are as summonable as the primals. Ala Mhigo tried to summon Rhalgar and failed or stopped by the Garleans. But what if the beastmen races succeeded in summoning the Twelve? The beastmen have their own lore and history so whichever deity from the twelve they summoned, had a different appearance, gender and name than the one in the lore of man. I tried to match each primal with one of the twelve and here is what I came up with:
Ifrit/Azeyma: during the opening cutscene of Ifrit's fight, it appears as if he is blocking the sun and then it appears as if he comes out of the sun itself. Azeyma is the keeper of the sun.
Titan/Nophica: the kobolds are miners and have plenty of ores and resources, so worshiping Nophica, the deity of soil and abundance, would be a solid choice.
Garuda/Oschon: Oschon is the ruler of mountains and god of vagrants. Ixali are trying to get back to their homeland so perhaps they consider themselves vagrants and chose their deity accordingly.
Leviathan/Thaliak: Thaliak is the god of wisdom and Leviathan taught his Sahagin minion how to obtain the echo. A scholar old enough to be worshiped would surely know how to do this.
Ramuh/Byregot: Ramuh is a well mannered primal and the slyphs have the prettiest housing items from their tribe quests. They have their own silk. Art. Byregot is the god of art.
Bismarck/Llymlaen: Llymlaen is the goddess of navigation and watcher of seas. But she commands the element of wind and not water. Sea of clouds, flying whale.
Shiva/Menphina: She slept with a dragon knowing that it's the ultimate sin. Menphina is the lover. Keeper of the moon. Fenrir, a wolf with moon-related abilities guards her crystal.
Ravana/Althyk: Althyk's sign is an hourglass and he's the surveyor of change. Maybe a nomad tribe would like to not be nomads? Also process of elimination since Nophica is taken.
Iceheart's words seemed genuine. Being biased to my own theory, here is where I went with her comment. The Garleans wanted to invade Mor Dhona, a land rich with Aether. Maybe due to their hate of Primals, or as they call them Eikons (eikon in Greek means image), they wanted to take control and reinforce the seal on the lake to prevent anyone from summoning anything. Someone (Hydaelyn? Zodiark?) didn't want that and awoken Midgardsormr to war against the Garleans. Shit hit the fan and the seal was broken. The Garleans equated those the echo and beastmen. And Iceheart, an echo user herself, showed us that she is able to summon. Just like Lou summoned the power of the twelve.
What I'm getting at here is, Eikons are different images of the same power/entity. When people are in distress, they'll summon their god of old. Their prayers would reach the appropriate member of the Twelve and it will appear in whatever image the people who prayed imagined. The Twelve are neither good nor evil. They'll be whatever the summoner wants them to be. For example, Garuda is crazy because the Ixal are crazy.
I might be on to something or I might skipped a cutscene where this is completely debunked in the game already.