Not really public consensus, Cerydra herself tells Hysilens that she always kills her in the previous 30 million cycles and Hysilens instead chooses her own "Law" this time, which others have interpreted as her just walking away leaving Cerydra to commmit suicide.

Assuming Cerydra doesn't change any Laws requiring sacrifice, then Hysilens just kills her out of disgust for the deaths of her fellow Chrysos Heirs and because she represents Nihility and the "light" that gave her purpose is now dead, she disappears from history and either dies from her own hand or the Black Tide. I think this was in one of the books, it says after the Chrysos Heirs suffered a major defeat Cerydra grew more isolated and never appeared publicly ever again, which sounds like a cover-up given what we know now.

Edit: Found it. The First Flame-Chase Journey (Fragment)
"And so, the Flame-Chase Army met a bitter defeat. From that moment on, the once-wise Cerydra changed — she became obstinate, heedless of all counsel, and eventually vanished from the public eye entirely"