Kahless ( clone ) The clone of Kahless the Unforgettable , also known as Kahless II , was created by the cleric s of Boreth in 2369 using DNA from the Knife of Kirom , a blade that was said to be stained with the blood of Kahless . The clerics and their scientists found a way to imprint specific information into the clone ' s mind . Specifically , they programmed him with the contents of the Klingon sacred text , stories and teachings of the original Kahless . Apparently , he was additionally programmed with a full knowledge of Klingon language and customs as well as how to defend himself in combat , although his lack of genuine experience proved to be problematic . The clerics wished to give the impression it was the real Kahless who had returned from " Sto - vo - kor " to once again lead his people . When Worf visited the planet Boreth , the clone of Kahless appeared to him . With the having been sent to bring Kahless back to the homeworld , Kahless accompanied Worf back to the ship , confident from Worf ' s tales of his comrades that they were honor able companions , approving of Worf ' s recognition of his Klingon heritage . Gowron attempted to test Kahless with the Knife of Kirom , but Doctor Crusher ' s subsequent analysis of the DNA confirmed that the blood on the blade and the blood of Kahless were identical . Kahless and Worf spoke of a new direction for the Klingon people , but Worf began to doubt that the clone was the real Kahless , because he could not remember the taste of warnog , or what existence was like in " Sto - vo - kor , " although he claimed that this was because he was only a traveler who was allowed to pass between the worlds and thus had no memory of the other side while in this one . After a brief debate in the holodeck , Kahless was challenged to combat by Gowron and was defeated , raising more doubts . In light of this , when confronted about the truth by Worf , the clerics finally admitted their fraud . Although Worf ' s faith was briefly shattered by this news , a conversation with Data inspired Worf to consider what Kahless could be for the Empire as a symbol rather than define him by his origins . Worf thereby suggested that the clone of Kahless be made Emperor of the Klingon Empire ; Gowron would continue to run the Klingon High Council and be the head of government , but Kahless could serve as a valuable reminder of what had once made the Empire great and encourage his people to remember their ways of honor . The clone of Kahless accepted and became the moral leader and the ceremonial head - of - state of the Klingon people . Before his departure from the ship , he told Worf that what mattered was Kahless ' s words and teachings , not the man himself , and as long as the Klingon people remembered those words it did not truly matter whether or not Kahless himself returned . ( ) Emperor Kahless II refused to talk with Worf when he investigated the reason that a large Klingon fleet was docked at Deep Space 9 in 2372 . Kahless ' lack of power as emperor became evident several day s later when the fleet launched an invasion of the Cardassian Union . Emperor Kahless condemned the invasion but was overruled by Gowron . ( ) Kahless II was present in the Great Hall when Kurn was dismissed from the High Council soon after . ( ) Kor was unwilling to bring the Sword of Kahless to Emperor Kahless when he , Worf , and Jadzia Dax discovered it in the Gamma Quadrant in 2372 . Worf had hoped Kahless would use the sword against Gowron . Kor , however , felt Kahless II was a " toothless figurehead " and a pretender to the throne . ( ) Appendices . Apocrypha . Emperor Kahless appears in " The Left Hand of Destiny " novels and the final " " novels . In J . G . Hertzler and Jeffrey Lang ' s novels , Kahless helps Chancellor Martok to regain his position after a " coup d ' état " against the Klingon leader . Kahless himself was believed to have been killed after fighting Hur ' q soldiers on Boreth , although it is later revealed he survived . He stands down as Emperor , as he felt Martok ' s accomplishments had made him irrelevant , but would one day return if his people needed him again . The book " Kahless " explores the myths behind the Unforgettable One . It goes into detail about how Morath was the honorable Klingon behind the revolt against Molor . It goes farther on to say that the blood on the knife that cloned Kahless was actually Morath ' s . That means that the clone of Kahless is really the clone of Morath . In the PC game " Star Trek Online , " Kahless is still Emperor when the Fek ' Ihri launch an invasion of the Empire from " Gre ' thor " , and Chancellor J ' mpok ( Martok ' s successor ) sends Klingon players to meet with him on Boreth . Emperor Kahless guides them into " Gre ' thor " itself to do battle with the Fek ' Ihri hordes , led by the vengeful spirit of Molor , and eventually against Fek ' lhr in the heart of " Gre ' thor " . After the Fek ' Ihri horde is banished , Emperor Kahless gives the player a replica of the Sword of Kahless . Emperor Kahless resurfaces during the Iconian War storyline as the leader of " House Pegh " , an order of Klingon infiltrators and assassins ; during a raid on an Iconian facility , he is killed by the Iconian T ' Ket in single combat , though the House Pegh operatives ( aided by the player character and their away team ) discover a critical weakness in the Iconians to exploit for the war to come . In the miniseries " " , a long - term plan set in motion by the descendants of Kruge results in what appears to be the death of Emperor Kahless at the hands of the Unsung - descendants of Kruge ' s followers who were subjected to Discommendation after his death - prompting Worf to consider a suitable battle to earn Kahless the honor of entering " Sto - vo - kor " when he didn ' t die in battle . However , his death is revealed to be a deception by a group of con artists who intended to ' study ' Kahless and thus fake the true return of Kahless later to manipulate the Empire for themselves . Despite his captivity , Kahless is able to outmaneouvre his captures and escape , reuniting with Worf while he has been forced to retreat to another planet with the remaining Unsung after Kruge ' s chosen heir , Korgh , betrays them . Spending time with the Unsung , Kahless is able to teach them what it means to be Klingon and recognize that their discommendation does not mean that they should reject their heritage , culminating in him joining the last of the Unsung in their new responsibility as guardians for Spirits ' Forge to win back their honor .