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The katra, or living spirit, was the essence of the Vulcan mind and could be transferred to another person moments before death.
The existence of the katra was controversial; many Vulcans thought it was nothing more than a myth, but a small group of Vulcans named the Syrrannites believed in it. In 2154, an event took place which brought the existence of the katra to the attention of the Vulcan people and its leaders, the Vulcan High Command.
Legend has it that ancient Vulcans used katric arks to store katras. Some of those arks were discovered at the P'Jem monastery centuries earlier. Although they were analyzed by Vulcan scientists (one of them even tried to meld with an ark), they were not found to contain a katra.
A highly notable surviving katra was the one of Surak, Vulcan's founder and father of Vulcan philosophy. Although Surak died in the 4th century, his katra survived to the year 2154 when it was briefly held by a Human, Captain Jonathan Archer, before its transferal to a Vulcan Priest. The reappearance of Surak's katra was instrumental in the rise of T'Pau's influence and the following reorganization of Vulcan government and society.
When a katra was transferred to someone, he or she will benefit from the experiences of the person the katra came from. Because the katra could resist its transfer, the procedure was not without risk and must be performed according to a specific ritual. Non-Vulcans might experience side effects like a form of multiple personality. Humans were especially vulnerable because of the severe shock a transfer can give to their nervous system. Restoring a katra to a Vulcan was preferably done by a Vulcan priest with enough experience with katras. (ENT: "The Forge", "Awakening", "Kir'Shara")
Vulcans could initiate a transfer of their katra by placing one of their hands on the head of the recipient and to position their fingers on specific points. Via a mind meld, a Vulcan was able to tell if someone had received a katra.
The katra could be restored when a person had died and his katra was transferred to someone, if the family of that person wishes to do so. This ritual is called fal-tor-pan, which literally means "the refusion". This ritual was performed very rarely. The last time was in 2285 when Spock's regenerated body was found on Genesis and returned to Mount Seleya, where his katra was transferred from Doctor McCoy into his own body.
The transfer of someone's katra was not regularly practiced and was only done in special circumstances. When a Human received a katra, the effects of the merge could be counteracted by lexorin, but this was only for a short period of time. The katra must eventually be transferred to someone else. Around 2369 the existence of the katra was common knowledge within most medical establishments. (Star Trek III: The Search for Spock; VOY: "Innocence"; DS9: "The Passenger")
Notable katra transfers Edit
- In 2154 the katra of Surak was transferred from Syrran into Captain Jonathan Archer during the aftermath of the bombing of Earth's embassy on Vulcan. After four days the katra was transferred to a Vulcan priest. (ENT: "The Forge", "Awakening", "Kir'Shara")
- In 2268, Spock temporarily had his katra transferred into Nurse Christine Chapel before having it transferred back into his own body. (TOS: "Return to Tomorrow")
- In 2285 Spock transferred his katra to Doctor McCoy moments before he entered the radiation room to give the USS Enterprise her warp capability back, so they could flee the Mutara Nebula before the Genesis Device detonated. Spock died of radiation poisoning and his body was "buried at sea" using a photon torpedo as a coffin. The torpedo landed on the emerging Genesis planet, though, where his reanimated body was later found and returned to Vulcan. There, on Mount Seleya the fal-tor-pan ritual was later performed by T'Lar at the request of Sarek, his father, to reunite his katra, carried by Doctor McCoy, with his body. (Star Trek II: The Wrath of Khan; Star Trek III: The Search for Spock)
When the Deep Space 9 crew encountered criminal scientist Rao Vantika, it was revealed that he had developed an artificial means of transferring his synaptic patterns into another body, compared by Doctor Julian Bashir to the Vulcan method of transferring their synaptic patterns to another. (DS9: "The Passenger") A similar transfer process was used by Tieran, an Ilari dictator, but he was born in the Delta Quadrant and thus would have had no experience of Vulcans to inspire his research. (VOY: "Warlord")
- In the Star Trek: Vanguard series of novels, the Vulcan science officer T'Prynn is a val'reth; she holds the katra of another, her would-be mate Sten, who she challenged for her freedom in the kal-if-fee, against her will, as Sten transferred his katra into her mind as he died and refuses to leave T'Prynn's mind until she submits to his will. It is, however, unclear whether the term val'reth refers to T'Prynn having been given the katra without her consent (in which case, Archer and McCoy could also be referred to as val'reths considering that neither of them consented to receiving the katra) or whether it refers to the fact that Sten's katra would not allow itself to be removed from T'Prynn's mind.
- In several Star Trek novels, reference is made to a chamber within Mount Seleya known as the "Hall of Ancient Thought". In the Hall are thousands of receptacles (vre'katra) containing the katras of the greatest and most powerful Vulcan masters throughout history. Vulcan scholars, philosophers, and mystics could petition to be permitted to meld with these katras for research or enlightenment.
- The novel The Lost Years deals extensively with the concept of katras and katra transfers. The novel speaks of an ancient warrior named Zakal, who died the day before the Romulans left Vulcan during the Time of Awakening, and his katra was stored for over two thousand years. When he was revived in the 23rd century, Zakal's first comment was that the Vulcans apparently hadn't run out of "S-names" for their male population.
- The novel Beneath the Raptor's Wing had the katra of Surak surviving in various vulcan priests after it was transferred from Captain Archer. One priest carrying the katra was killed by a Romulan assassin and the katra was lost, with Archer feeling this loss due to the time he spent carrying the katra despite being several light-years away.
- According to Exiles, book two of the Vulcan's Soul trilogy, there was a womb of fire where katras were reborn, and katras could dissolve.