What Could Have Been

I slowly awaken from a vague dream. I notice that it is daytime, so I slowly get out of my bed,accidentally taking the covers with me. I casually use my magic to place them back on my bed. I head downstairs. I don't see Spike anywhere, but then I realize that it is his day off.  He didn't particularly want one, but I forced him to take it. He's just a baby dragon, after all. I notice a sealed note in the middle of the floor. It is marked with Celestia's emblem. I idly wonder why the note is on the floor instead of on your desk or something like that. I then progress to actually opening the  note before reading it.

Twilight Sparkle, head to Canterlot Castle immediately.  I have found something rather unusual,  and you may be better capable of understanding it than I am.Sincerely, Princess CelestiaWell, that was a short note. I wonder what Celestia would need my help with this time.