Twilight has been invited to the archaeological discovery of the century, a door older than Equestria itself. A door which hides an ancient weapon of 'peace'. Her curious mind may lead her to bite off more than she can chew.
Meanwhile a certain apple farmer struggles with her words, and a revelation, to admit her love for a librarian, and accept her fully. No matter what.

Below the surface, an ancient past, long forgotten by even the great sisters, stirs. And it has found it's new Authority.