The True Emissary of the True Prophets was the title conveyed upon Kai Weyoun in the alternate timeline created by the formation of the Red Wormhole and the start of the War of the Prophets.

The True Emissary was the corporeal representative of the Pah-wraiths of the Red Wormhole who wished to unite with the Bajoran wormhole. (DS9 - Millennium novel: The War of the Prophets)