Citadel of the Autarch, chapters 16 to 19
Severian goes on his errand for the Pelerine priestess, meeting a hermit, who dwells in a house where the top stories are in the future - and it's an icy future for Urth, where no New Sun comes. So much for prophecy.
Trying to take the hermit out of his dwelling, Severian finds that he evaporates, coming from only a possible future rather than the future. So much for prophecy again.
Getting back, Severian finds the Pelerine camp and lazeret destroyed, with only Foila there, dying. He promises to share the stories told. Severian then runs into a mercenary unit and takes part in an initiation challenge, which he wins or subverts. The next chapter will reveal which.
There's a lot for me to think about in these chapters, but I'll let others talk first.