Oh boy. At this point, you could go all out. You could let Simeon, Kiernan, Foebane, and most everyone else die.
Let the remaining hero attend the play, and have the other players play some level 1-3 characters (visiting dinitaries, Lyceum students, etc.) who hang out in the back row with him. At this point, run the scenario as usual. Allow the heroes the chance to notice Giorgio leave through the stairs and follow after him. Giorgio locks the door behind them, and the under-powered party will probably lose. Make sure the "left behind" hero only gets knocked out (or at least no coup de grace). Sheena Larkins (the only NPC I really think the other adventures depend on) unlocks the door from the inside just in time to see Giorgio finish the teleportation sequence and jump overboard with the other perpetrators. She
teleports the one hero and any important NPCs you want to save back to the Lyceum (less than a half mile so does not fall afoul of the pylon) and then uses
healing word on the hero to keep him from dying.
If you want to use the future adventures without needing to write in new NPCs, save Simeon, Kiernan, Foebane, Sheena Larkin, and Tiljann (I think that's all the important ones). Oops, nevermind about Tiljann (too soon?
).
So the
Wayfarer's Theater is likely destroyed as it would be hard for the outmatched "B" team to prevail against the saboteurs. This leaves what to do about the Seaquen flotilla and the hurricane. Pickfort and the Ostaliners should whip the town into a frenzy and form the flotilla that attacks the Shahalesti blockade. It doesn't really matter that Sheena Larkins and the hero know differently; the flotilla is running on a mob mentality at this point unless the heroes turned Pickfort before all this.
Meanwhile, the rest of the heroes are a day's travel away dealing with the witch. Lee Sidoneth is timing the hurricane to strike when the flotilla is engaging the Shahalesti fleet, and the heroes are in the wrong place. Either you have Seaquen be devastated by the hurricane, or you need to get the heroes back together.
If Seaquen is destroyed, you can narrate the destruction. The remaining hero, Sheena Larkins, and the other survivors of the
Wayfarer's Theater shelter in the basements of the Lyceum. The people on the north side shelter in their basements. Much of Seaquen is devasted, but many of the inhabitants of the north side survive. The refugee camps, however, are a site of complete carnage, with no shelter, the sustained hurricane kills most of the refugees minus a few who make it to a shelter (such as Foebane's fort). The Ragesians use
sending to report a successful mission, and withdraw until the army can reach them through Dassen.
If you want to give the heroes a chance to save Seaquen, they need to get back to Seaquen posthaste. A
sending spell from someone in the Lyceum can notify them of the situation. Sheena Larkins would have used her bardic inspiration to ritual cast
teleport after having someone use
scrying to locate the heroes. Her plan would be to teleport herself to the heroes' location, have the heroes (who are warned she is coming) heal her unconscious body, and then ritual cast
teleport with all of them back to the Lyceum where they get healed before they die from the fire damage during teleport. Unfortunately, she is redirected by the pylon to a cell in the pyromancer's tomb. After 30 minutes, the heroes get another
sending asking why they have not returned yet. A third
sending urgently begs them to return immediately to the Lyceum without delay. The heroes can return in 5-6 hours, but they likely get a point or two of exhaustion which can be handled by medics at the Lyceum. Seaquen is half destroyed at this point, and the heroes can head out to the ruins to stop the hurricane from finishing the job (and save Sheena Larkins). More of the inhabitants and some of the buildings of Seaquen survive, but most of the refugees are still dead.
Regardless of which direction you choose, Seaquen is likely no longer strong enough to be the center of the resistance. The heroes need allies and a new place for the resistance to relocate. They first turn to Dassen, setting up the next adventure. The heroes are sent with Balan as an advance group before the rest of the resistance relocates. If they are successful there (gosh I hope so; your heroes need a win), Dassen becomes the new stronghold of the resistance, and Bresk is hit by the Scourge super weapon in adventure 8.
I have to say, I am impressed by your willingness to let the heroes make their own decisions and not be led around by the scenarios in the adventures. You have truly made this saga your own, and I hope that you and your players continue to have fun with it.
P.S. And [MENTION=6781484]Mrpereira[/MENTION], having Shaaladel be the allied commander, completely cruel punishment, but totally appropriate to the situation.
I laughed out loud when I read, "if only Foebane was still alive."