Twilight shook her head. “That castle has more defensive magic on it than any structure like it—nothing with hostile intentions towards Equestria or any of the castle’s inhabitants can enter. And I’ve kept it well-supplied—that’s where Ponyville kept its emergency supplies. Ever since I put in the well, the ponies inside could probably last a year. More, if they use the balconies and top floors for growing. But they’ll probably leave those locked, since they’ll think griffons or climbers might get in that way.”