Kuvah'magh is a Klingon term roughly translating into "savior".
23rd century Edit
In 2270, blood from the kuvah'magh was sent into the past to cure the Klingon Augmentation Virus, commonly referred to as the "Curse of Arrogance". Romulan agents from the Tal Praenax intercepted the blood and transported it to a secret base on the Son'a world of Tsi's'du, within the Briar Patch. From there, they attempted to reverse engineer the blood into a bio weapon. The Klingon High Command discovered the Romulan plot and sent the Klingon fleet and it famously became known as the Battle of Klach D'kel Brakt.
After the Battle of Klach D'kel Brakt, the Klingon High Command sent Ki'TaQ and the crew of the IKS Qoj'chu on a secret mission into the Delta Quadrant, to ensure the completion of the predestination paradox. (Star Trek Online, Star Trek Online: The Battle of Klach D'kel Brakt).
24th century Edit
A Klingon D7-class battle cruiser full of Klingons, believing they would find the kuvah'magh left the Empire in the mid-23rd century on a spiritual journey to find him or her. By 2377, the group, now led by Kohlar, encountered USS Voyager in the Delta Quadrant, and believed Voyager chief engineer B'Elanna Torres was pregnant with the kuvah'magh. (VOY: "Prophecy")
After the discovery Torres's baby was not the kuvah'magh, the Klingon contingent discovered Keyvon and believed him to be the kuvah'magh. After several events leading some Klingons to believe Keyvon was, in fact, not the kuvah'magh, Choz gathered followers in an attempt to overthrow Keyvon from power. (Star Trek: Tales of Discovery)