A saviour foretold in the sacred scrolls of a Klingon sect that left the Empire a century earlier, identified by its leader Kohlar with the unborn daughter of B'Elanna Torres.
The kuvah'magh is a messianic figure in the scriptures of a group of Klingons who rejected their corrupt Empire and set out on a generational voyage to find her. The scrolls say she will lead them to a new home.
The belief is the subject of the Voyager episode Prophecy in 2377. An antique battle cruiser attacks Voyager in the Delta Quadrant. On learning that B'Elanna Torres is carrying a child, its captain, Kohlar, declares the baby the kuvah'magh, destroys his own ship and brings his two hundred people aboard. He is weary of the journey and wants the prophecy fulfilled, whether or not it is true.
A doubter, T'Greth, challenges Tom Paris and later tries to seize the ship. The claim gains force when antibodies from the unborn child cure the nehret, a fatal illness the Klingons carry, and they settle on a nearby planet.