What Source do you take this from? An official publication, or a fan-made write-up somewhere?
In general my attitude is that so little has been done with the Neverborn for the most part, especially from an official side, not even such basic things as describing what they look like or what Primordials they used to be, that we're free to make stuff up as it suits us.
The most extensive description I know of is actually Revlid's Underworld, in which Abhorrence is described as a giant lab complex full of self-writing blackboards and giant uranium-beaker holoscreens that constantly try to calculate exactly how much hate the lingering corpse feels towards the Creation and humanity that killed it, I just worked from there.
Now, we could say that Abhorrence is the Neverborn of Ramethus, sure, but that would require giving up one of the Mad Max Neverborn or the Murderous Science Neverborn. Or, since there isn't anything to contradict us, we could declare that He Who Was Ramethus is in fact a new and entirely different Neverborn from Abhorrence, and get two Neverborn to play with instead. So I really don't see why we'd do the former, actually.
Though granted, I've been severely out of the loop since a little after 3E came out, so there may have been new developments since that actually do clarify in a way that contradicts this. If such happened, w/e, pick whatever suits you best.
Sorry, I must have made an inference based on something I read here - I'll take
@Revlid's word unless he comes in and says he's changed his mind on the matter.
Still - and I've been meaning to say this for a while - the "scientists" that dwell in the more stable pieces of Calculated Abhorrence of Life probably aren't trying to usher in the Age of Metal. After all, clanky metal automata are a very small sliver of phenotypes in the massive, sprawling, index of things you could make with enough applied thaumaturgy, Sorcery, and Charmtech. They'd probably just want to kill mankind (destroying the Exaltations themselves would probably be put off as a "long-term" problem) and replace it with something better, something that could soothe the endless hate of their ever-dying godhead further.
Something none of them can agree on any details of, since Abhorrence of Life as a coherent being kind of doesn't exist beyond "
HATE HATE HATE HATE", so all they have to go on are the opinions of his various hekatonkheires, most of which are completely insane now and none of which would have agreed even before, just like Ligier and the Scar of Empires would have trouble agreeing on what would make Malfeas happy - or alternatively, sifting through the various cyst-spawn, strange behemoths, and other mangled thoughts-made-flesh that spill forth from the death wounds of Abhorrence of Life's corpse, which is even more fruitless because you have no way to determine what the actual Neverborn's opinions on these funhouse-mirror atrocities might be, even disregarding his response would realistically just be something like "
HATE HATE HATE HATE HATE".
So what you'd have is a bunch of Byrgenwerth motherfuckers fighting over what particular flavor of nightmare is what their master really wants, while failed/escaped experiments in creating The Perfect Being haunt the byways around their enclaves eating travelers.
IIRC there was something hinting that the Abhorrence of Life was Mardukh.
Really? Mardukth, Who Holds in Thrall -> He Who Holds in Thrall makes far more sense for obvious reasons.
More specifically, Mardukth ---> He Who Holds in Thrall because the Neverborn are degenerations of their Primordial selves. By killing the Unquestionable souls that represented the length and breadth of their inner natures & beliefs, the Exalted Host robbed the dead Primordials of their moral and ideological complexity. Mardukth, who encompassed concepts like vastness, belief in higher powers, observation bias, and the ideal of the man-made-myth, was pared down until all that remained was the most insulting, shallow interpretation of his fetich soul's ideal that "the strong naturally gather weaker beings under their leadership": a faceless oppressor forcing the weak into mindless servitude.
Hence why, in the interest of making the Neverborn and the Labyrinth carry at least a little nuance, I would set things up so there are behemoth-like beings in there that capture some of the nature of their former 3CDs, whether because they're unusually clear recollections of a Neverborn's lost souls or massively weakened splinters of the dead Unquestionable. Likewise, you would have (relatively) benevolent, or at least
sane, memory-behemoths from less painful instances of Neverborn recollection.
Of course, you'd also have things like "Autochthon, as the Neverborn imagine him in their darkest screaming nightmares" or "the Exalted Host, fuzzily remembered as a shining horde of cannibal monsters eating the Neverborn alive" roaming around down there...