(Spoiler) About amaurots downfall

[MrThinker]

An alternative possibility could have been suggested by the Anyder dungeon, though, and the lore associated with it. Anyder teaches us that a) Lahabrea was a professor of something called "phantomology" which as far as I can tell is creating monsters for science and as a strange art form, and b) that Anyder seemed to have trouble controlling its creations. We know Archaeotania broke out, and a bunch of creatures did as well, none of which seems directly related to the crisis

Archaeotania was a monster begotten by the Final Days in a different city, that the Akademia researchers captured to study and understand what the Final Days actually did. It is through this that Lahabrea came up with the theory that the monsters born of the Final Days came from the ancients deepest subconcious fears, and came up with the idea of Guardian Forces, monsters requiring sacrifice of the entirety of an ancients lifeforce, that were designed specifically to combat the threat of the Final Days.

It can be theorised that the process behind the GF's would later be expanded upon by Lahabrea in his design for Zodiark, and the GF's can be considered 'demi-primals' of a sort (not the summoner-type demis, but just half-baked primals, which maybe primal Enkidu can be shoved under).