You got mail... from an alien

Twilight woke up at 6am. She knew it was going to be another long day of festivals and activities. Something different every day, truly masterful planning on Sol’s part.

She looked over to her nightstand, and saw a letter. The stamp was made of black wax with a five headed dragon imprinted on it. Two heads looked to the right, two to the left, and one to the center, and the center head had four horns, where as the others had only two.

She picked up the letter and began to read.

Princess,

I'm sorry this is being delivered on such short notice. Believe me, I would have delivered this way in advance but due to certain circumstances I was not able to. I cannot tell you who I am, at least, not at this time, but we will meet in person soon enough.

My agents and I have been watching you since the very beginning. We've watched your progress and we've watched you grow. When you became an Alacorn we knew the time was right. We knew what would come next and now we have entered the calm before the true storm. The only thing you need to know is that the enemy is on our doorstep. The one who's been pulling the strings for the past nine years. You defeated all his minions, Nightmare Moon, Sombra, Chrysalis, Tirek, Cozy Glow, and "Grogar". Grogar was the one my agents and I were looking for. Grogar was only the herald of the coming Darkness.

As of now you have two options on what to do with this information. Either you make it public and rally Equestria’s armies under your banner and plan your defenses, or you can keep this information secret. Besides, you might sound like a mad-mare if you try and tell anyone. Secrecy is my best weapon after all. Don't worry, you don't have to reply. My agents are always watching and they'll report to me what you decide to do with this information.

We work in the Darkness to serve the Light,
A friend

Twilight was confused but she shrugged it off since she had more important things to worry about. She just stored it in the back of her mind and went to et ready for the day.

She really should have been a lot more worried...