This is a bit of a hypothetical question as my players managed to avoid this situation, but it got me thinking.
My players finished Runeforge last night by clearing out the necromancy wing. The fight with Azaven was very close to being a disaster for them: Azaven's opening attack of a finger of death at the party's sorcerer literally left him with 1 hp.
The sorcerer's player asked me afterwards what would have happened to the party if the sorcerer - their only caster - had died in that fight.
So, my question: are there any ways, as written in the adventure path, for the party to escape Runeforge without a spell caster? (I couldn't think of any, but perhaps I missed them.)
The Master Circle in the Halls of Wrath can be commanded to call an outsider. this outsider could be persuaded to take the PCs home.
Also there is a cape of the mountebank in the Pride wing which can be used to activate the Circle.
Good to know some options do exist!
Heh - well there is always trying to make a deal with one of the wings...
And a really desperate party could always try dumping someone in the runewell to see what happens...
I mean... nothing in the book anyway but I can think of a dozen things I could have fun doing to...*cough* for my party... :)