Twilight Sparkle: Ugh, I've gone through every book in Ponyville, Spike, and there isn't a single mention of the mysterious chest that came from the Tree of Harmony, nor anything about keys to unlock it! But something tells me that opening it is pretty important. I hope Princess Celestia has some ideas. If the library in Canterlot doesn't have anything, I-I don't know where else to look!