This story is a sequel to The Longest Night

As her twenty-first birthday dawns, Twilight Sparkle finds her simple life turned upside down. While her birthright forces itself into her life, Twilight also has to deal with the arrival of three Alicorns. No pony knows where they came from or what they want, and the Alicorns seem intent on keeping themselves and their purposes hidden. To uncover the truth, Twilight will set sail for distant, ancient lands with old and new friends.

Side-Stories: Velvet Sparkle and the Queen in Stone, Myths and Birthrights: Anthologiae, A Dream of Pride and Envy, The Castle Canterlot, by Honey Mead

TVTropes Page

Pre-readers/Editors: Honey Mead, WNA, Cerulean Voice
Cover art by Saint-Juniper

Comments Contain Spoilers

Twilight did her duty. She saved everypony she could, except herself. Now trapped by an evil cult, in more pain than she has even been in before, and dying on a sacrificial altar, she calls for help. The Nightmare answers.

Will Twilight become the next evil to threaten the world or will the Nightmare simply be glad to have some freedom? One thing is for certain, Twilight's life will never be the same again.

The Editors
Cander (CH 1-Current)
Yutah123 (CH 8-9)

Now with an excellent reading by StraightToThePointStudio (Currently only up to CH 30)

And we even have art!
[Warning Spoilers] Twilight's Nightmare Art