Percy Jackson and Annabeth Chase have gone through a lot. They fought the Minotaur, Medusa, a Manticore, the Chimera, Kronos, and even Arachne, the Spider Queen. It was during this last fight that they recovered the Athena Parthenos, a sacred statue that would help secure the demigods' victory over Gaea and the Giants, but the unexpected happened: the floor gave away, and the pair fell all the way down to Tartarus. The first thing they noticed, was that a large mirror, that no monster would approach, not even for some tasty demigod blood. They were trapped, and the only way to save themselves, was through that mirror. What was on the other side, however, was even wilder than they ever thought possible.

(Added romance tag and made story "Teen" for planning on future chapters, and romance mostly in post-story Extras section.)

(Being a big Percy Jackson & The Olympians fan, I couldn't help but notice that Tartarus existed in Equestria, according to Twilight. This story recounts the events of Percy and Annabeth's journey into the other side of the Pit, and beyond.)

A thousand years ago, Princess Celestia banished her sister to the moon, that much we know. What wasn’t known, and what Celestia kept secret was that before her banishment, Luna had given birth to a foal. Now a thousand years later, as Nightmare returns to Equestria to bring about Eternal Night.

Twilight Sparkle, protege of Princess Celestia, struggles against the tyranny of this ancient foe. But how will she be able to save herself and her friends when the truth of this ancient legend crashes down upon her? Twilight will have to confront herself...and her heritage.

Polaris501