"Your Highness!" The two Royal Guards of Princess Celestia ran to her throne, where she was reading a letter from Princess Cadence with a perplexed look on her face. Surprised, she looked up."yes, what is the matter?" She asked."Your highness, there have been reports of dark beings and disappearances of ponies in the Crystal Empire." Celestia didn't look surprised. "Yes, this letter from Princess Cadence mentioned that." Celestia said, a worried look on her face. "I want you to double security, and call Princess Luna back at once." Celestia demanded. "At once." The gaurds nodded and galloped off.
Celestia started writing a letter to Princess Twilight Sparkle:
Dear Twilight,
There has been a thread to equestria's security, I need you to gather your friends and come to Canterlot at once. We don't have much time, I will explain the situation when you get here.
Princess Celestia.Celestia signed the letter as fast as she could and sent it, then using her magic to form a shield around Canterlot, just as Shining Armour had done on the previous security threat.
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Fall of Equestria
Fanfiction"I'm afraid this is our worst threat yet." Equestria is under threat, yet again. But this threat is different, as is has the power of a Changeling, The Dark King, to bring Discord to the land, and the power of a Nightmare.