I have a theory about what happened to Raverne Draconia, and it has nothing to do with Crowley (surprisingly).
I think that Raverne was turned into stone.
If he is based on Diablo the Raven from Sleeping Beauty, who was turned into stone by Merryweather before the final battle, then there’s a pretty good chance that also happened to Raverne.
I also think that whoever the Housewarden of the Aurora dorm is (most likely the Good Fairy that put Silver under the sleeping curse to protect him) was the one that did it.
It would be SUCH cruel irony if it turned out to be true, too. Malleus is obsessed with gargoyles and grotesques, and his father got turned into a grotesque. Ouughhh if this turns out to be true, I’ll actually lose my mind…. Ough….