The Final War

Luna was in her room studying upon magic and reading in general when a voice spoke up

"Luna." the voice said.

Luna's ears perked up and she immediately looked up, her jaw dropped at the sight, there standing the Great White Alicorn that had just talked to Celestia early in the morning unbeknownst to Luna

"M-M-M-M-Mother?!" Luna said in disbelief, before continuing. "N-no... this isn't right, you aren't real!" Luna finished, before throwing a book at what she believed to be some sort of trick being played on her eyes.

Faust Simply Caught the book and through it back at Luna, who almost got wacked in the face with it due to her lack of attention, before she realized it was floating in front of her, held by Faust's magic

"You should pay more attention young Luna." Faust said.

"B-B-But HOW?! H-how are you here?" Luna asked.

"I am not completely here. I can only see you and Celestia one at a time, I cannot see you both. Whenever you sleep, or whenever you are not in the same vicinity, I will see Celestia. Whenever Celestia is asleep or not in the same vicinity as you, I will see you, my youngest daughter." Faust replied.

"But... how can you possibly manage this? Is it some form of magic I don't know of?" Luna asked in a curious tone.

"Indeed, daughter, it's a form of magic that not even you or Celestia know, as it's roots have been lost over the times. I have already visited with Celestia, while you were asleep." Faust answered.

"...I bet that's what that broken mug was from.. not her not paying attention..." Luna murmured.

"Indeed Luna, when I come in her sight, she dropped her mug and it shattered on the floor." Faust added.

"Can anypony else see you other than my sister and I?" Luna asked.

"Only one, and that would be Discord." Faust replied.

"Luna, I need to make something clear to you. Firstly, tell Celestia not of this conversation. When I have Spoke with Discord, then you all 3 may reveal your conversations with me, but do not reveal them beforehoof. And more importantly, whether you realize it or not, Celestia is in distress." Faust said in a serious manner.

"In distress....? What do you mean mother?" Luna was completely lost.

"Your sister is letting her own dark spirit begin to control her. The Solar Spirit, essentially the Sun's version of the Nightmare Spirit. Please when you reveal your conversations let Celestia know that I told her do not try to attempt to find a way to bring me completely back. She simply can't understand that level of magic yet." Faust said in a serious tone.

"I understand mother. I will make sure to warn her." Luna replied in a loyal manner.

"I know you will daughter, but try to keep an eye for any signs of her mood worsening." Faust said.

"I will mother." Luna Replied.

"And Your sister actually went to Ponyville." Faust stated.

"WHAT?! She said she was just going for a little stroll!" Luna said, a bit panicked.

"Calm child, she is simply going there to visit with her former student and now 4th Princess, Princess Twilight." Faust stated.

"Oh ok... wait... how do you know Twilight?" Luna asked, confused.

"A magician never reveals their secrets my lovely daughter of the night." Faust said with a smile.

"Oh phooey..." Luna said, slightly dejected.

"Oh you'll be fine Lulu." Faust said, calling Luna by her nickname.

"I haven't heard that name in millenia..." Luna said, a small tear coming to her eye and a smile as she hugged her mother's neck, to Faust Luna was about as small to Faust as a normal pony was compared to Celestia.

"I must go now Luna, I do in technicality have more time to spend with you, but I do not want to show favoritism." Faust said before hugging her daughter back and nuzzling her and then seperating.

"I... I understand mother... I hope to see you again soon..." Luna stated.

"In due time My Little Pony, In due time." Faust said with a smile, before fading away to nothingness.