Random predictions for tonight's finale, just to have them on the record!:
We don't get any kind of explanation for why Jace is following Porter.
None of the current Ratgrinders survive. The party tries not to kill Mary Ann but she goes into the lava attempting to murder Fig.
On the flip side, Lucy gets established as being raised in the epilogue, as does Yolanda.
Riz's spell he's holding onto is Hold Person; I'm not sure that Kipperlilly bites on it, though - tactically it makes SO MUCH more sense for her to try to kill Kristen, but she DOES have that specific hate on for Riz.
We do get an end of season cliffhanger into a theoretically Senior Year, involving something with Bobby Dawn.
To my dismay, we don't find out Ayda's reaction to her library being overrun with cats (who are freely going through the portal in between Mordred and the Compass Points because of course they are), forcing me to write at least three fanfics on the topic.
Gorgug dies but gets revived.
Fabian has a TERRIBLE time in the epilogue, with something getting established about Chungledown Bim AND Gilear and Hallariel announcing that she's pregnant with Octuplets.
Kristen and Cassandra fully reconcile, but Cassandra keeps more elements of the Nightmare King than they had at the start of this year.
Bucky does NOT convert to Cassandra.
Seacaster Manor has to open the pool to all students since it is now located on school grounds. (The pool was part of the manor that went into the sky - you can see it on the side of the ship mini.)
Porter dies and ends up stuck in an ironic hell, a plane of pure peace and passiveness.
I have a wave of sadness at the season being over approximately three seconds after the last playing of Teenage Rebellion starts.