“I´ll say Princess Celestia, the idea of this vault is marvelous!” Twilight Sparkle say, making no effort in hide her excitement of being in a room filled with dozens of magical artifact.

“Well Twilight, considering all the problems you and your friends have faced in the recent times, I thought that we needed to take more precautions. We don´t want another Alicorn Amulet incident, do we?” Celestia say in her usual cheerful tone.

Twilight always admired how Celestia managed to remain calm. Even after the whole ordeal with the corrupted vines that infested Ponyville, Celestia didn´t seem fazed at all. Twilight realized she had a lot to learn about being a Princess.

“Everything is secured on its place, sister,” Princess Luna said, standing next to the mysterious box that sprouted from the Tree of Harmony.

Celestia thanked her sister with a soft nuzzle. “I suppose everything is here then. I´ll give you a copy of the key, Twilight. Just in case you need to check on any of these items.”

Twilight was flapping her wings in excitement, something that made Luna giggle, but before Celestia handled her the key, Twilight remembered something she was carrying on her saddlebags.

“Wait! I think you should add this to the collection…”

“What is this object?” Princess Luna asked, looking at the bottle of shining white fluid.

“I´m not entirely sure. Zecora only said she got it from a merchant back in her homeland but has no idea where it comes from, only that it was somehow related to you two. Something about being an object from an alicorn princess. What do you think, Princess Celestia? Princess?”

Celestia wasn't listening to Twilight. She was facing the opposite direction, not looking at them.

“Princess?”

“So this is the fabled potion that allowed you to look into the past, Twilight?”

“Oh, yes Princess Luna. One sip and I was able to see the night…” Twilight didn´t finished her sentence, figuring that Celestia didn´t want that incident to be mentioned anymore.

“And you claim is connected to our past?”

“So it seems.” Twilight kept looking at Celestia, who was hanging her head low.

“It is possible. Several objects were ransacked from our palace after it was abandoned, such as the cursed Alicorn Amulet. But I do not recall this particular item. Perhaps a taste of it will help me regain my memories?”

“Worth give it a shot,” Twilight said and Celestia chose that moment to turn around, but before she could say a word, Luna had gulped enough of the potion to make it work.

******

“Where am I? Wait, I remember this place. Our old private library. What is my sister doing?”

“One sip of the white flower juice will make you remember. One sip of the purple root...will make you forget…”

*****

“Princess Luna? Are you okay?” Twilight asked the Princess once she came out the trance. “Did you saw anything? Anything useful?”

“I saw...I saw you.”

Twilight pointed at herself, confused, but it was obvious that Luna was talking to the other alicorn in the room.

“I saw you mixing a potion and then infusing it with magic. I saw you drink it, drink the root of the Wandering Vine.”

“The Wandering Vine? I remember that name, isn´t it a plant that causes travelers to forget where they were going?” Twilight asked out loud but Princess Luna passed right next to her and confronted her sister.

“You chose to forget? To forget about me?!”

“I was trying to forget the bad memories. The moments of pain and sadness, of betrayal,” Celestia said, still unfazed.

“My betrayal! My memories! You wanted to forget me!”

Twilight didn´t know what to do. The sister were arguing, or rather, Luna was screaming in rage while Celestia remained stoic. She remembered what happened the last time they were like this and didn't want it to end with either sister vanished for another millennia.

“Please, maybe we can…”

“It hurt to remember, sister. I needed to stay calm to rule the kingdom and raise both the moon and the sun. With you gone, I had to take on both responsibilities. And the nightmares were making that difficult,” Celestia said.

Luna wasn't taking that explanation well and Twilight was afraid she will explode any second now.

“But now…” Celestia said, breaking her calm tone and showing she was struggling. “I don´t need to hide those memories anymore.”

Both Twilight and Luna gasped when Celestia suddenly lifted the bottle with her magic and gulped it down, right to the last drop. They watched in shock as Celestia's eyes flashed as memories long forgotten returned to her, causing her to collapse.

“Princess Celestia!”

“Sister!”

Twilight and Luna hold Celestia, who was crying. Crying without trying to hide her pain, crying for the first time in a thousand years. Luna and Twilight hugged Celestia and cried along with her.