Princess Celestia has invited Twilight to visit her in Canterlot to attend a royal banquet, and she is excited to see her beloved mentor again! When she arrives she is shown through the castle to see Celestia and notices majestic bouts of beautiful magic, namingly a gorgeous incantation that covers the ceilings of the mystic castle. The enchantment mesmerizes Twilight, and when the Princess of the Sun explains to her that it is her sister, Princess Luna's charm that inhabits the brilliant archways. After a delightful dinner with the princesses, Twilight spends time with Luna and is shown the secrets to the the magic of the Princess of the Night. It is a magical evening that brings the two closer than they would have ever imagined....

Twilight travels to Canterlot to comfort Princess Luna. Thus she spends much time with the royal alicorn -- but not only in the living realm of Equestria. Strange dreams of the regal mare start to overtake her sleep, and soon Twilight realizes that the Princess is triggering feelings she has never felt before.

Can Twilight admit her emotions to Luna? If so, how? And then why is Luna turning into Nightmare Moon again?

Read and find out.
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A/N: Fic is going to be a TwiLuna shipping (no clopfic).

Plus, the story may get dark/adventurous or sad, I'll add the categories when there is actually a part of that category in the actual story.

Twilight becomes alicorn of the stars. This is sort of a problem, because Luna kind of already was alicorn of the stars. Oops!

TV Tropes

Twilight prepares for the most important night of her life. But it doens't go exactly as she had wanted...

Story was inspired by SolFoe's Study Interruption

Twilight Sparkle is called away to tend to Luna when she falls ill. As Luna grows sicker and Twilight more determined to help the younger princess, she begins to uncover dark secrets about the elements, the alicorns, and her own past.

Twilight ventures out into the mountains to see a once-in-a-lifetime event. Disappointed by her friends not coming with her, Twilight crosses paths with a kindred spirit.

This story is a sequel to Off The Edge Of The Map

When Twilight is sent with Luna on a diplomatic mission to Draconia, they quickly find themselves somewhere that doesn't appear on any map, and Luna is lost in more than one way...

Thanks to RBDash47 of Pony Fiction Archive for formatting it for submission.
Title image by Valcron

Tremendous thanks to Illya Leonov and Scribbler for the Audiobook version.
Now with a Spanssh translation by SPANIARD KIWI: https://www.deviantart.com/spaniard-kiwi/art/Apoteosis-2-3-857110089

Celestia leaves to deal with a foreign crisis, giving her sister a chance to rule alone and become more attached to the modern world. She calls on Twilight Sparkle to advise Luna, hoping her student will be able to draw Luna out of her shell. With two major threats to Equestria already defeated in the past year, it seems like the perfect time to let Luna gain some confidence and experience in the modern world. After all, what are the chances of a third disaster occurring?

Now comes with complimentary tropes.

Princess Celestia lies unconscious without explanation… And the sun refuses to rise. Desperate, Luna calls upon her Sister’s faithful student for help in an effort to enter the Princess of the Sun’s mind through a dreamscape to find the cause of her mysterious coma.

But once they enter, finding themselves in a place of magic itself, a place where a pony’s fears, dreams and histories manifest themselves as worlds of epic proportions, are the two mares ready for what they find inside?

An action fantasy novella.
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