The Devandiré Sibylline Codex, or Devandiré Codex, was a rare book on the occult originally written in Sanskrit, an ancient language of India used by Hindus and Buddhists. The only known copy was under the possession of the Watchers Council but Rutherford Sirk stole it when he left the Council and joined Wolfram & Hart. It was contained within Wolfram & Hart's ancient prophecies wing, and could be conjured by the Wolfram and Hart Source Books.