This chapter was written by Vengeful Demon.
"Oh, this is bad, this is really bad."
Twilight was currently making her way towards Canterlot. She knew that she should have written to the princesses the second that she heard about the plan to 'visit' Tartarus, but she hadn't, and now both Applejack and Rainbow Dash were gone.
"I just hope that I'm not too late."
"Princesses!"
Twilight barged into the throne room, catching the regents of the sun and moon off guard, this was the first time that the young princess had ever simply dropped in, unannounced.
"Princesses, we need to go to Tartarus!"
Both princesses simply stared at her, taken aback by that last statement.
"Twilight, maybe you should start at the beginning."
"So, Applejack's dreams were telling the truth, this is not good."
"Luna, what are you talking about, did you know something about this?"
"Well, yes and no, a couple of nights ago, We- I visited Applejack during her sleep. She was having some sort of nightmare, where she was in Tartarus, and Rainbow Dash was dead." The princess began pacing the room. "I didn't think much of it at the time, chalking it up to be a simple nightmare, and nothing more. But recently, Rainbow Dash has been having strange dreams as well."
"How strange, princess?"
"She dreamed of Mephistofilly, queen of Tartarus."
Upon hearing this, Celestia's face grew stony.
"This is worse than I imagined, Applejack and Rainbow Dash are in grave danger. The queen of the underworld likes to make deals, and her deals always have dire consequences, masked behind a promise of good fortune. We need to get to Tartarus, now." She turned to look at her sister. "Quickly, go get Discord, he's going to help get us there."
"Sister, what do you plan to do?"
Celestia smiled to herself, "Simple. We're going to knock on Meph's door."