Sword of Stars

From Memory Alpha, the free Star Trek reference.

In Bajoran prophecy, the Sword of Stars was an object that, according to interpretations of Trakor's Third Prophecy, would destroy the Celestial Temple.

The prophecy appeared to come true in 2371, when an experimental communications array caused a Gamma Quadrant comet to alter course toward the Bajoran wormhole. Although attempts were made by the USS Defiant to destroy the comet before it reached the wormhole, three fragments survived to enter the phenomenon. Their concentration of silithium - which could have destroyed the wormhole - was largely contained by a warp field from a type-18 shuttlepod. The comet fragments thus emerged in the Bajor system, leaving a subspace filament in the wormhole. (DS9: "Destiny")