I'm currently running this game and my party of 3 so far has been steamrolling everything. They cleared the top of Drezen in one game day, but I supplemented the Staunton fight with a CR 13 Wizard (the one from the demon knights section of the villain codex book) with about 7 incubi (There's a monk that can clear many enemies quickly, a paladin that's the single-target killer, and an alchemist crafter). It was an even fight, and the PCs only JUST made it out alive. The paladin ended up dying, but he was rezzed shortly thereafter.
However they just got to the bottom section and killed the vampire. Most of their buffs are wearing off, and they're out of abilities pretty much. So they want to spend a mythic point to get a 15min rest in the citadel. Realistically speaking, what happens then? Does that tiefling lady crumble the castle on them, or do they get captured and placed in that working anti-magic cell? Like what do I do?