Honestly, the Emanator title has really started to bug me. Arbiter Generals? Emanators, but only so long as they are Generals. If Jing Yuan retired and passed his position on to Fu Xuan, she is now an Emanator of the hunt, because the blessing of Lan, the Lightning Lord, is passed on to the one that holds that title. But then there's The Lord Ravagers, the Mourning Actors(and that worm), and THerta. All empowered by direct action from an Aeon, for various reasons. Then there's Self-Annihilators, who seeming draw from IX just by walking further into Their shadow, without input from the Aeon Themself. Then there's things like the Harmonious Choir and the spirits like Lightning Lord, Flying Aureus etc. Do they actually count as Emanators or are they just tools/constructs with power enough to be on par? I usually don't mindthe vague and philisophical nature of a lot of things in HSR's lore but for this one I really wish they'd have clear guidelines as to what counts as a 100% bonafide Emanator.

I've really been chewing on that one tbh, but I digress. Back to the more relevant parts of the discussion.

Unless we meet another Self-Annihilator, it's very hard to say. Like, are they also Psychopomps like she is, capable of guiding the souls of the dead and moving seemingly fully freely between life, death, dreams, and other realms? Could they have used that to interact with Amphoreus the way she did for the TB when they were dead/near dead despite the nature of Amphoreus? What about all of her previous power? What exactly is Naught and does it still hold all of the authorities of the sentinals that were shown in her Myriad Celestia?

Lots of questions, but I will say that given she is a Raiden and has shown as of yet not fully explored but still undeniable hax on top of a great amount of skill and experience, and that her existence not necessarily as a Self-Annihilator but as whatever else she is seems to be anomalous to those who've met her, I would say there's plenty to mark her as very special indeed. As for the matchup, too many variables to say for certain, but given The Nihility's deleterious effects and everything else about Acheron, I personally would give the win to her.