So, I guess that whatever happened in the French port in the 18th century (in which Elias started being called Pilum Murialis) is what caused him to go live with Rahab for a time. I suspect that the owner of the woman face that Elias sometimes uses was involved in that incident.
I also think that there is a reason for which Elias stopped living with Rahab, that Rahab didn’t tell Chise. It’s suspicious that she asked Chise not to tell Elias about her, and that Elias didn’t introduced Chise to her (although that last thing might just be because Elias is Elias).
First Alice and now Stella have contracts with Fae. I wonder what type of magic will Ashen Eye allow Stella to use.
I hope they return to College next chapter. It would be nice if we also learned more about the Conclave.