I haven't properly written up the whole thing, yet, but I figure a rough summary is in order.
Nothing interesting turned up from Sylvia's notes.
Mr. Willoughby arrived. Discussion ensued. Cass is not universally trusted: check. The weasel attack indicator reaches a level of "Probably not." Indeed, no weasels attack.
Teleport to the fish pond in Castle Greywind. Cass is, of course, sitting there waiting. Fish appear to be undisturbed.
Further discussion ensues. Prophecy is revealed to be generally annoying: Too much precision, and you lock yourself into a specific future - if it's the one you wanted, great. If not, tough luck. (Thurion's prophecies provide an excellent example of the dangers of being too good at seeing.) Not enough precision, and you can't figure out what you need to know.
Cass has the Crown of Eyes already; that line of the original prophecy
can be safely ignored.
Cass is working towards a redemption of Hunger-In-Darkness - something that would render his imprisonment unnecessary as well as freeing him from it.
Original prophecy, followed to the letter, may not result in that goal. Some user discretion is advised.
Events currently paused at: Cass asked Luma and Stewart when she's going to be seeing some grandchildren. Both are flustered; neither has an immediate answer.