A previously unknown Orb of the Prophets, buried in the desert of Tyree, which Benjamin Sisko unearthed and opened to restore the wormhole and the Prophets.
The Orb of the Emissary appears in Image in the Sand and Shadows and Symbols, the opening episodes of Deep Space Nine's final season. After the wormhole closes and the other Orbs go dark, Sisko has a vision of a face in the sand that leads him to discover his real mother, Sarah, and a pendant inscribed with ancient Bajoran writing.
He travels to the planet Tyree with his father, Jake and Ezri Dax and digs up the Orb's case in the open desert. A false vision sent by the Pah-wraiths, in which he is the writer Benny Russell in an asylum, almost makes him bury it again.
When he opens the case, the Prophet inside flies to the wormhole and drives out the Pah-wraith. Sisko then learns that a Prophet had possessed Sarah in order to ensure his birth.