Book 2 of 3 in the Star Trek: Deep Space Nine miniseries entitled Millennium.
"Caught in the crossfire of the apocalyptic confrontation between the Bajoran Prophets and the Pah-wraiths, Captain Benjamin Sisko and his crew face what might be the final millennium. On one side, the Pah-wraiths' new Emissary—Kai Weyoun—promises his followers that when Bajor's two Celestial -Temples are restored as one, all beings in the universe will ascend to a new and glorious existence with the True Prophets. On the other side, the scientists of Starfleet predict that when the two Bajoran wormholes merge, they will create a Warp 10 shock wave of infinite destructive power."
Note: Elim Garak plays a large role.