Razmir has been killed and replaced by the bard Ilythyrra, who is supposedly secretly Mephistopheles, Lord of the Eighth. Normally, this would make him (her? Him?) Alexeara's highest priority, but - he was told of this by Cyprian, who heard it from Catherine de Litran, who is secretly Myrabelle, who may herself be Mephistopheles and is one of the most gifted liars on the plane regardless. Which is to say, Alexeara does not actually have very much reason to think that Razmir is secretly Mephistopheles, rather than non-secretly an evil archmage pursuing godhood.
The Archmagi Cotonnet, when asked, aren't much more willing to comment on Mephistopheles' identity than the Goddess, but they are willing to comment on Catherine de Litran. Élie seemed to be trying, in some sense, to reassure him and utterly failing. Myrabelle, according to Élie, is an immortal body-stealing witch who lived many lives before the death of Aroden; (At least three over two-hundred fifty years, he concludes after reviewing de Luna's notes) She's not a servant of Hell and genuinely opposed Cheliax, (The same could be said of Baphomet, but this at least disconfirms her being Mephistopheles, insofar as he trusts Élie's knowledge) she's evil (he knew that) and hates and wants to destroy all the gods. (Deeply concerning!)
...Also Élie turned her into a book and read her entire life history. This is rather hard to argue with, as an evidence base, but also seems suspiciously convenient. Élie is confident that he couldn't be fooled this way; Alexeara has no way to check that. Well, he has one way to check that.
(Is Élie Cotonnet correct in his assessment of Myrabelle's character? UNCLEAR; Is Élie Cotonnet correct that Myrabelle could not have faked being turned into a book or caused that book to have misleading contents? UNCLEAR)
He asks Élie, somewhat rhetorically, whether he thinks Myrabelle is going to do anything that would be unusually evil in someone who's not an evil archmage, like killing millions of people in evil rituals or creating an army of the undead to conquer the planet. Élie answers that he thinks she probably won't do that while he's around. Alex asks what will happen when Élie is not around. Élie says they'll cross that bridge when they come to it, which Alex feels is rather missing the point.