"Celestia's log, stardate, I'm not too entirely sure...I've had a troubling experience today. First, I should mention that I placed a time-space protection spell on myself so my memory wouldn't be erased when Q and Discord disrupted the timeline. I managed to acquire this 'captain's log' technology from Captain Picard. Anyway, I'm not sure if what I did today was the right thing to do or not or if I was just being selfish.
"I thought that my sister Luna had been fully cured of her Nightmare Moon possession when the Mane 6 had banished it using the Elements of Harmony. I was horribly mistaken. For some reason, somehow, when she interacted with the ponies at Nightmare Night, the spirit inside of her reactivated. I don't know how are why, but it did. As revenge, it wanted to kill the Mane 6, one by one, for imprisoning it. It's first target was Pinkie Pie and it succeeded. Luna was resisting at first and went in and out, but eventually, it fully took over and it killed Pinkie Pie.
"At first, I knew the right thing to do was to banish her from all Equestria and I did. When the guards kicked her out, she fell unconscious. That's when I knew how much this all meant to her. I couldn't let her be banished. I had to do something. I used my neuralizer to erase the memories of all the ponies who were involved in this. Then, I used transporter technology from the starship Enterprise to force Pinkie Pie's molecules back together and used magic to bring her back to life. It's same old Pinkie Pie and it's as if nothing ever happened.
"Still, I don't know if I should have kept it all a secret. I'm not even sure if I should know about it. Maybe I could erase my own memory...in fact...Computer, delete log." "Captain's log deleted." the computer voice said. Princess Celestia held her neuralizer up to her face and got ready to press the button. "I-I just can't..." she said, dropping it to the floor. "I just can't..."