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// Prologue: Let there be light 
// Story: Equestria and the Librarian of her roles namesake 
// by shcalda 
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In a large city, a great tree of light rose from the sky. Unstopped by anything, it shone straight with warmth in its core. For three days, there was only light be it day or night.

However, the light was meant to shine for seven.

After three days of light, as if there was no light at all, the city was covered in darkness for four days. This event would be known from then on as “White Night, Dark Day”. No one knew what caused this event, and no one ever would.

For the cause of this light had left their world entirely.

In Equestria, every alicorn felt something change.

Princess Celestia excused her day court, taking the rest of the day to plan.

Princess Luna entered the realm of dreams, seeking visions of events yet unknown.

Princess Cadance confided in her husband, hoping to rationalize her thoughts.

And Princess Twilight sparkle, as was her reaction to most things unknown, began studying, searching for knowledge of the sudden shift within books and tomes.

All of them felt a sudden change, and though they knew not why, all of them felt dread that day.

Elsewhere, a seed of light sprouted, and from it, came a great Library.