Disclaimer: I haven't played Necrom yet (planning to try to finish it before Gold Road), I've only played the Necrom and Gold Road prologues so far, so please forgive me if this is addressed in Necrom. These are my own musings based off of possibly outdated information.
Hermaeus Mora allegedly knows everything. It's obvious he knows a lot. He even knows possible events in different timelines, similar to the elder scrolls themselves, which no other entity in TES lore seems to be capable of knowing. However, if he knows everything, that implies he'd have to know about the Dream, and thus CHIM, Amaranth and the Godhead as well... but this contradicts existing lore on those subjects, doesn't it? When someone understands the existence of the Dream, they'd have to either zero-sum or achieve CHIM. Furthermore, if one understands CHIM, they're on the path to understanding Amaranth. Considering Hermaeus Mora's desire to simply know, and not to directly interfere with fate (which we'll undoubtedly learn more about when we learn more of Ithelia), I'd imagine he'd want to mantle the Godhead himself as that'd be the most surefire way for him to achieve that goal, yet he remains conscious unlike the Dreamer.
So, does he know about these things? If not, is he merely exaggerating or is he lying about his own nature? If he's exaggerating, that implies ego is most important to him (even over knowledge itself) but if he's lying about his own nature, that means he's keeping a secret that could eventually be exposed by anyone who achieves CHIM, so that leads me to believe he is neither lying nor exaggerating... so obviously, he has to have quietly achieved CHIM himself, right? But that makes me wonder, how is that possible? The Dwemer were unbelievably smart but their knowledge led them to zero-sum because they couldn't reconcile the nature of reality with what they already knew. I'd imagine it'd be even more impossible for Hermaeus Mora to achieve CHIM for this very reason.
Or, I might be getting unhinged a bit here, but...
Maybe Hermaeus Mora is a semi-lucid, albeit ironically unwitting manifestation of the consciousness of the Dreamer and Apocrypha is not a realm of Oblivion, but rather, a depiction of the Dreamer's knowledge. Thoughts manifested in orderly ways, like a mental library, not the poetic Aurbis. After all, a painting is simply the artist's thoughts and emotions put to the canvas. This would explain the intrinsic connection to Nirn that is mentioned when Mora requests the Vestige's aid in saving Apocrypha: as brain damage impacts one's imagination and creativity, damage to Apocrypha -- the analytical "brain" of the Aurbis -- will directly corrupt the work of art which is Mundus.
This also explains why he manifests in such a strange way compared to the other Princes. What if he is not a mass of tentacles, but rather, a dream-state image of a neuron? Subconsciously, the Dreamer has imagined their mind but, to a fantasy society without the ability to evaluate a brain at a microscopic level, Mora looks like a Lovecraftian tentacled horror. Furthermore, we know that Mora had a role in locking Ithelia away and causing most of existence to forget her.
Ithelia is the Prime Archon, the eldest of the Magna Ge.
The Nine Coruscations tells us that the second-eldest is Mnemo-li (memory). There is always a "Prisoner Unbound", game heroes, who are also associated with Ithelia's sphere of influence and those heroes change the course of the Dream (with one mantling madness itself, and another effectively mantling Shor). Mora locked Ithelia up because she had the potential to destroy the Dream by making everyone
understand.
Nu-Mantia or Numancia (loving the alternate spelling). The Dreamer is in a coma and wants to stay asleep, therefore their semi-lucid mind is attempting to preserve the status quo by preventing any aspect of the dream from Amaranth.
This also somewhat goes hand-in-hand with my personal belief that Lorkhan himself was the direct and fully lucid avatar of the Godhead and that, by tricking the et'Ada (figments of the Godhead's imagination) into creating Mundus, the Godhead betrayed their own mind causing a descent into madness: when the Aedra killed Lorkhan, the Godhead's mind broke and they became a Dreamer in a comatose state. The Godhead wanted to wake up by showing everyone the mystery of
the Tower. Their descent into comatose madness created Sheogorath, led to Mora's protection of the Dream and all along, the Shezzarines have simply been the Dreamer's last vestige of hope trying to wake from their mad dream. That theory probably isn't true, and like I said, it's just my own speculation but I feel like it relates here.
At the end of the day, that's
all just my own speculation. I could very possibly be way off the mark. However, I think we can definitely agree that
The Nine Coruscations might just be the heaviest lore drop we've had since MK was still working at Bethesda. The implications of Ithelia, her motivations and what that book tells us about her, it's massive. It changes the way we view virtually every bit of the Dawn Era and TES metaphysics as a whole. As Kirkbride fan and a lover of TES metaphysics, Dawn Era lore, the Ayleids and their understanding of magic, Gold Road is shaping up to have some of my favorite lore in the franchise!
Isachar Daerenfel of Alinor, Psijic Sage, Master Wizard of the Mage's Guild and heir to the Daerenfel Trading Co.
TES megafan since Morrowind
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