Princess Luna was pacing around the throne room, questioning her judgement on whether or not she should have started teaching Peachy Keen the Final Nightmare Power that night. After the appearance of Nightmare Moon and the summoning of the demonic Rocket Sky she had opted not to bother teaching her at this time. But in all honestly there was something else holding her back from teaching Peachy, something that she would regret if it ever came to pass.
"I should have known you wouldn't be able to stop thinking about that after all," came a familiar voice as her sister stepped out of the shadows, "not after all that has happened."
"I am not teaching her the Final Nightmare Power," Luna bluntly stated, turning her back on her sister as she stared out into the night sky, "I will not run the risk of creating another Nightmare that could terrorize the citizens of Equestria, not after what had happened to Rocket Sky a year ago."
"That wasn't your fault Lulu," Celestia calmly said as she watched her sister stare into the night sky, "It was the actions of Chrysalis that created the monster that is nearly taken care of. A few nights ago you told me that almost every shred of the demon had been eradicated from the dreams of our little ponies, but now you're terrified of fighting it again. What happened in the Dream World this time?"
"Nightmare Moon appeared Tia," Luna replied, blinking away the tears that started to fill her eyes, "She attacked my student and summoned the remainder of the demonic Rocket Sky, which proceeded to attack Nightmare. I should have just left the two alone to fight it out and trained my student somewhere else, but instead I arrived and banished them back to where they came from. I doubt that Peachy Keen is even interested in learning the Final Nightmare Power anymore, not after what she had just witnessed."
"You doubt the will power of your own student?" Celestia asked, surprised that her sister would say such a thing to her.
"Of course I do," Luna snapped, not surprised that Celestia would question her choice, "You know all to well what had happened to me when I attempted it the first time. Right now I don't want the same fate to befall my student, who shouldn't even be training to control the shadows anyway. I don't even know how an earth pony can control such a force."
"Please Luna, the answer is obvious," Celestia replied calmly, not letting her anger rise due to her sister's snapping, "Rocket Sky is a powerful unicorn who had a forced ascension into alicornhood, no thanks to Chrysalis for creating the demon in the process to make it happen. Then comes my adviser, Inner Wisdom, who, despite being a pegasus, acts almost like Pinkie Pie and has a considerable amount of knowledge that makes him see somethings before others do. Their friend Tick Tock, the General of Cadence's army, is a master of soundwaves, yet the reason he can't complete his 'Bass Cannon' is because Cadence won't give him the crystal he needs."
"Why are you telling me this Tia?" Luna asked, turning around to face her sister.
"Because each of those three are potential threats," Celestia answered, "One unicorn to control sound, one earth pony to control nightmares, one pegasus to control wisdom, and one alicorn to control balance. Tick could shatter our armies abilities to hear everything, while Peachy could knock them into their own worst nightmares and Wisdom could beat them without breaking a sweat. And I won't even go near Rocket at this point."
"Okay, so each of them are a threat just waiting to happen." Luna sighed, sometimes it wasn't worth talking to her sister.
"Yes, but that's not the point," Celestia countered, "I trust my adviser, just as Cadence trusts Tick. You need to trust your student and have some faith that she will be able to pull off the 'Final Nightmare Power' as you call it. I still say that the name is ridiculous."
"I shall call the Nightmare Form whatever I please," Luna loudly said, turning to face her sister, "and if I decide to call it the Final Nightmare Power then that is what I will call it. At the moment I shall not teach Peachy the Nightmare Form, but maybe at a later date I will. How is your Adviser doing?"
"He's apparently building some sort of mansion near Ponyville," Celestia answered, looking past her sister, "A temple where peace and harmony are sacred."
"If its not one thing with these ponies it is another thing," Luna groaned, noticing a pike figure approaching from behind Celestia, "and it looks like we have company."
"Cadence!" Celestia exclaimed, turning around to see the Princess of Love walking up to them, "What are you doing up at this hour?"
"I would ask you the same thing Auntie," Cadence replied, walking right past Celestia and stopping next to Luna, "I thought you, of all ponies, would be asleep at this time of the night. But from how the two of you were talking to each other it seems that you were discussing the possible threats to Equestria. Spill it you two."
"King Rocket Sky and his friends," Luna admitted easily.
"My General is not a threat," Cadence snapped, "though I would admit that the King himself is a dangerous pony if he were to suddenly turn on us. Wisdom has some...interesting abilities that could damage us, but I also believe that Peachy would be able to control herself and make sure that everypony is safe."
"Told you Luna," Celestia grinned, watching her sister face-hoof, "Peachy Keen can handle the Nightmare Form."
"If it will make you happy I will begin tomorrow night," Luna growled, cursing her sister for staying up too late for once, "I have Night Court to attend to and they don't like to be kept waiting. Later."
Luna vanished and left the two alicorns alone, which was perfect for Celestia to let out a yawn that had been building for the last ten minutes. Cadence let out her own yawn as well. Both of them were tired and needed to hit the hay for the night.
"See you at breakfast Auntie," Cadence said, her horn lighting up slightly.
"You too Cadence," Celestia replied, watching her niece vanish by magic.
Celestia smiled and returned to her own room, quickly laying her royal jewelry on her table before throwing herself onto her bed. She yawned once more and then wandered off into the Dream World, allowing herself some bliss at long last.