The Reckoning commences
The Reckoning was a battle prophesied by the ancient Bajorans, that would take place between a prophet and a pah-wraith at "the gateway to the temple," which was later found to be Deep Space 9.
Long ago, a tablet prophesying the Reckoning was kept below the city of B'hala. The Reckoning itself had long been forgotten by Bajoran scholars. The tablet remained hidden for thirty thousand years, until 2374 when archaeological digs at B'hala uncovered it, and invited the emissary to the Prophets, Starfleet Captain Benjamin Sisko to come see it. Ranjen Koral gave Captain Sisko, his son Jake and Major Kira Nerys a brief tour of their progress excavating the city before showing him the tablet — which foretold his arrival, the only decipherable ideograms reading "Welcome, Emissary."
It started with an instability of the Bajoran wormhole, which caused floods, earthquakes and storms on Bajor. It eventually turned out to be a showdown between the Prophets and the Pah-wraith (or "Kosst Amojan") at the "Gateway to the Celestial Temple." For the battle, the Prophets took possession of Major Kira's body, the Pah-wraith of Jake Sisko's. The battle ended without a decision when Kai Winn flooded the promenade with chroniton particles, forcing both entities to leave the station. (DS9: "The Reckoning")