Celestia was having breakfast with Luna after raising the sun when she suddenly received a letter from Twilight Sparkle.  She noticed that the letter was addressed to both her and Luna, "Strange...  It must be urgent if the letter is for my sister as well as me." she thought.  When Celestia and Luna read the letter, they both decided to head to Ponyville at this very instant.  Before they left, Celestia wrote a letter for Twilight Sparkle.

Dear Twilight Sparkle,

I am utterly shocked by the arrival of these 9 new ponies!  The fact that one is a vampire with the appearance of a child nearly made me have a heart attack!  I am intrigued but disturbed by the fact that they eat meat, and I have never heard of anypony having the exact same cutie mark as another pony!  I hope that you and your friends are safe, for Luna and I shall both come to Ponyville this morning.  I regret having to tell you this, but a darkness that even I am unfamiliar with has arrived in Equestria with these 9 new ponies.  What's worse, this darkness is sentient.  We shall discuss this when Luna and I arrive in Ponyville.

Your mentor,

Princess Celestia.

As soon as the letter was sent, Luna and Celestia headed out to Ponyville.  When Twilight read the letter, she was excited to hear that Luna and Celestia were coming to Ponyville, but she was upset that the darkness from the world of the Dark Brotherhood was sensed.  Twilight decided to gather up her friends and the members of the Dark Brotherhood to meet Celestia and Luna.

On the way to Ponyville, Luna felt some morning sickness, and Celestia asked Luna if she was okay.  Luna said, "I'm fine Tia.  I am probably just feeling a little motion sickness from the chariot."

Eventually, Twilight saw the outline of Luna and Celestia's chariot approaching Ponyville.  The chariot lands and Princess Celestia and Princess Luna step out of the chariot.  Celestia takes a close look at the members of the Dark Brotherhood.  The first thing she notices is that they truly do have the exact same cutie mark.  Celestia was slightly discomforted by Shadowmere; she felt like his blood-red eyes were staring into her soul.

Luna was the first to speak, and she said, "Greetings.  I am Princess Luna, and this is my sister Princess Celestia.  She rules over the sun and day, I rule over the moon and night.  And you are: Astrid, Veezara, Babette, Gabriella, Festus Krex, Arnbjorn, Nazir, Shadowmere, and Cicero."

The Dark Brotherhood was shocked to hear that Luna already knew their names, and they asked how she knew their names.

Luna replied with, "Not only am I in charge of the night and moon, but I also look over ponies' dreams.  I can see the dreams in everypony, and I can see their minds."

Celestia then spoke to Babette, "I am going to brighten the sun to test if you are truly a vampire."  As she said this, the sun brightened and Babette feels actual pain from this.  Acting on instinct, Babette bites Celestia on the neck with her fangs piercing the skin.  Celestia screams from the pain, and she darkens the sun to its normal light.  Babette then lets her fangs out of Celestia's neck, leaving two marks where her fangs pierced Celestia's skin.  Twilight and her friends are shocked by this act of harm against Celestia.  Celestia heals the bite marks on her neck and purges the disease Sanguinare Vampiris (which causes vampirism) from her blood.

Gabriella uses the Calm spell to calm down Celestia and Babette.  They glow blue, and Twilight asks what kind of magic it is that Gabriella used.  "I simply used the Calm spell.  It's a spell from the Illusion School of magic.  If you'd like, I can find a few spell tomes for you to learn Illusion spells."

Twilight replied with, "I'd be glad to learn these Illusion spells!"  Twilight also thought to herself "These Illusion spells might come in handy in my later adventures, or possibly the contracts once they start coming."

"Tia, would you and the Elements of Harmony please let me talk with these 9 ponies in privacy?" said Luna.

Celestia respected Luna's wish, and she went to Twilight's library with the Elements of Harmony.

"Hang on, I'll soundproof this conversation." said Luna.  "Okay.  I'm about to tell you of a prophecy in our land, members of the Dark Brotherhood."

Astrid then said, "How do you know of the Dark Brotherhood?"

Luna replied with, "I know because I have seen your realm.  I saw a glimpse of Tamriel a thousand years ago, and I learned of your Family.  I had a conversation with your Dread Father, Sithis."

Cicero then said, "WHAT?  Sithis...  Spoke to YOU?!"

Luna nodded in response.  Luna then started to tell the Dark Brotherhood of the prophecy.  "The prophecy is this; when 9 bearing the mark of a black hand on them arrive in Equestria, the princess of the night shall birth the child of an elder god from another realm, and that child shall lead the 9 with the mark of a hand as well as hear the voice of the elder god's bride.  In other words, when you members of the Dark Brotherhood came here to Equestria, Sithis visited me and he shall have me bear his child, and that child shall become your new Listener.  The Night Mother disapproved at first of another woman bearing a child of Sithis, but she accepted it when she knew that it would allow her will to be spread across the fabric of reality."

The Dark Brotherhood had visible looks of shock on their faces.  All they could say was, "When?"  Luna replied with, "Sithis visited me last night.  He explained the prophecy to me, and he took physical form and impregnated me."

Astrid then asked, "When shall the Listener be born?"

Luna replied with, "9 months from now."