The Artifact

The Artifact was an altered representation of one of Aguilar de Nerha's genetic memories.

Aguilar's Journal
''It is a good day, as we freed the world from the Executioner of Saragossa, thereby saving dozens of innocents from fiery death. As he died, he confessed that Ramirez retrieved a precious artifact from St Rafael Abbey on his way into hiding. We will search the Abbey for clues to the nature of this mysterious artifact. Could it be a Piece of Eden that he possesses, or some other powerful artifact? We must find out!''

Retrieved Documents

 * My loyal Ramirez: I have discovered that the Staff of Eden was broken into three pieces, and one of them is located in the crypt of St. Rafael's Abbey. Retrieve it, faithful Ramirez, and bring it to me! -Grand Inquisitor Torquemada
 * My loyal Ramirez: Our victory is surely at hand! I have found new clues that will lead me to the Apple of Eden, and it shall soon be mine. In the meantime, I am counting on you to find and secure the other artifact. -Grand Inquisitor Torquemada

Reference

 * Assassin's Creed: Rebellion