Vault of the Dark One

"The vault will only restore the Dark One in exchange for another life."

- Belle French to Emma Swan

The Vault of the Dark One is an Enchanted Forest location featured on ABC's Once Upon a Time. It first appears in the fifteenth episode of the third season.

Trivia
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On-screen Notes

 * The cover of the book which holds the key to the vault shows an image of the Gnostic deity Abraxas. The text and the image is a replica of the engraving on one of the Abraxas stones.
 * The page with the key is a transcript of a page from Book VIII from De Civitate Dei (The City of God), a book of Christian philosophy written in Latin by early Christian theologian and philosopher Augustine of Hippo in the early fifth century.
 * The page contains part 1, and the start of part 2, from Book VIII. An English translation can be found on Project Gutenberg: http://www.gutenberg.org/files/45304/45304-h/45304-h.htm#Page_305
 * The book that Belle used to identify the symbol on Neal's hand is written in Latin.
 * The symbols on the vault includes the tomoe, the triquetra, the triangle, the Eye of Providence and the pentagram. Circling all the other symbols is the Ouroboros, which represents cyclicality, especially in the sense of something constantly re-creating itself—fitting for the vault of the Dark One.