Grown Mechs
Someone engineered an exobeast species that could replace the role of mechs!
There had to be a reason for this effort! Both Ves and Dr. Tillman determined that the wild god's genome had been a product of a cross-disciplinary team that consisted of both mech designers and exobiologists.
Those professions ordinarily never came into contact with each other. Their fields of expertise almost never intersected with each other.
In the rare cases that they did, their combined efforts usually produced atrocities such as organic mechs!
In a way, the god species of Aeon Corona VIII should be an offshoot to the early research to design an organic mech. Instead of starting from scratch and attempt to create a perverse form of life from nothing, the exobiologists and mech designers who presumably survived the Starlight Megalodon's crash had taken an existing species and messed with their genes so much that they didn't resemble their predecessors at all!