All right guys, shit's going down.
Alhoon has destroyed the Magma Stone. The undead Heatran that lives under the volcano has woken up, and it is pissed. Smith knows about the stone and what it does, so he's gonna try and get everyone the hell out of there before it all goes to hell.
However, there will be tremors as the volcano begins to become unstable, and a rockfall will block the path that they used to come in, leaving traveling to the main chamber the only option. Smith states that he knows a way out from there. But once they get there, an enormous earthquake and a massive explosion will indicate that Stark Mountain has erupted. More rocks will fall, and the magma that pours down the mountain from the crater will harden, sealing off all the exits and trapping them in the chamber.
Smith says that he can dig them out, but doubts he can do it quickly enough for them all to survive. All the while, more tremors mean more rockfalls, not to mention that the chamber will be crawling with undead; many of them Fire-types, making them very aggressive.
Heatran will be rampaging below them, making the eruption worse. Smith eventually decides to find Heatran and kill him, thus ending the eruption and letting them all escape in safety. Whether they actually manage to do this or not is up for debate, given how hostile the environment has become. Temperatures will rise, and thirst and dehydration may become a problem - there is no water in the chamber at all.
In other words, your characters will be lucky to get out of this alive.
...Thoughts? XD If anyone has any ideas, feel free to post them.