HK - 51 series assassin droid The HK - 51 series assassin droid was a model of Hunter - Killer series assassin droid that was manufactured by the Czerka Corporation shortly before the end of the Great Galactic War . Biography . Despite the ban on HK - series assassin droid s by the Galactic Republic , the Czerka Corporation started to develop and manufacture several HK - 51s on Nar Shaddaa in secret during the late stages of the Great Galactic War . This order was for the reconstituted Sith Empire , who intended to deploy the new droids around a decade into the Cold War . Lost and found . Sometime after 3668 BBY , the Sith warship " Fatality " , carrying the droid shipment , was hijacked by a Dread Masters ' apprentice , who attempted to land and deploy them upon the planet Belsavis to in a bid to rescue his captured masters . The Republic ' s unit stationed on the planet shot down the vessel , which crashed and sank into the frozen waters of Section X . Not only was the only known shipment of HK - 51 units lost , but slicers of unknown affiliation managed to delete all schematics of HK - 51 ' s design from Czerka ' s network . The only known remaining copy rested on board the disappeared Czerka research ship called the " Theoretika " , which lost connection with Czerka ' s network , saving it from the slicer ' s attack . The " Fatality " and its lethal cargo remained hidden until around 3640 BBY , when the escaped Dread Masters finally located their stolen cargo . Upon its rediscovery , the Dread Masters swiftly secured the site . They fought off severe attacks from both Republic and Imperial forces , causing major causalities for both sides . The Dread Masters managed to hold onto the wreck , attempting to access its cargo - hold containing the HK - 51s , until an unknown spacer fought their way through the Dread Masters forces . The spacer managed to enter the cargo - hold , but was disappointed to find that almost all HK - 51s aboard were beyond repair after the crash and years of exposure to the frozen environment . Only a single HK - 51 was salvageable , but even he needed several critical parts replaced . Unfortunately , due to the loss of the HK - 51 schematics , not even Czerka had the parts required . Undeterred , the spacer left to locate the wreck of the " Theoretika " and the last copy of the lost schematics . Galactic scavenger hunt . Arriving on the " Theoretika " , discerning what had happened to the wreck , and defeating the monstrous experiments on board , the spacer found and downloaded the HK - 51 schematics . After departing the wreck , the spacer began their search for the parts HK - 51 required . Their search led them to the Outlaw ' s Den on Tatooine . There the spacer found a Jawa who sold them a wrapped HK transistor , as well as a Burba Seismic Excavator / Scanner , which would help locate the remaining parts . The spacer searched the Sinking City of Taris and the Glacial Fissure of Hoth , and even enlisted help to search the Dark Temple of Dromund Kaas and the Jedi Temple of Coruscant . Even still , more parts were required . The loyalty chip was recovered from the legendary Force user Revan upon the spacer encountering the ancient Jedi . Lastly , the necessary Weapons Protocol software could only be found in the memory banks of the infamous assassin droid HK - 47 , who had been found , repaired , and upgraded by the newly proclaimed Emperor Malgus . Defeating the ancient droid and recovering the last component needed , the spacer returned to the wreck of the " Fatality " . Once again fighting their way through the Dread Master forces , the spacer reentered the " Fatality " . With the help of a droid engineer assigned to them , they repaired and reactivated the sole surviving HK - 51 . Upon activation , the droids drew his weapon and frightened off the engineer before cheerfully greeting the unknown spacer . The spacer recruited HK - 51 to join them upon their adventures , the droid accepting the spacer as his new master . An efficient and loyal companion . While serving his new master , HK - 51 started to become aware that his combat / assassination efficiency was swiftly declining . Analysis of the trend also showed that if this continued , then he would eventually be unable to function . The problem was discovered to be a failsafe subroutine buried deep within HK - 51 programming . This failsafe would cause the eventual shutdown unless HK - 51 successfully assassinated at least one individual on a implanted kill list , though killing anyone would slow the degradation of his protocols . His master dispatched HK - 51 to assassinate one of these targets , a mission that HK - 51 successfully completed . After the mission , HK - 51 reported that his protocols were as efficient as the day he was manufactured . Coming to admire his master , almost to the level of idolization , HK - 51 worried that one day he would be reprogrammed to turn on the master he so respected . Searching for a way to resolve this , HK - 51 found a loyalty subroutine ( most likely within HK - 47 ' s loyalty chip recovered from Revan ) that would permanently set his loyalty to his master and anyone his master specified . Even if reprogrammed , this subroutine would prevent HK - 51 from attacking the spacer . HK - 51 was overjoyed and congratulated his master and suggested they celebrate by killing a large number of enemies . Zakuul Alliance . By 3632 BBY , HK - 51 was present on the Eternal Alliance ' s base on planet Odessen . The Outlander , HK ' s previous master , later appeared and organized the group into attacking the Eternal Empire . During a party at the Odessen Cantina , the droid was confronted by Tora , who mistook him for HK - 55 , a droid she just recently encountered with the Outlander on the Spaceport Asylum , despite HK - 51 ' s confused denial . Characteristics . HK - 51 was designed to be a lethally efficient assassin / bodyguard and to take great enjoyment and pride in his duty . Quite unlike his predecessors he was programmed to be very polite , cheerful and friendly to his master and his master ' s allies . His programmers felt that previous models were too unsettling in their brutality . HK - 51 himself even referred to models like HK - 47 as " unstable . " HK - 51 did not seem to express any sort of hatred or disgust with organic beings or other droids that was so common to previous HK models . HK - 51 also expressed dislike of political backstabbing and faction infighting , though he would partake in both if ordered to by his master . While he was capable of both precision assassinations and mass murders , he much preferred to assassinate singular targets who were difficult to hunt . In this way , he was much more like HK - 47 than his direct predecessors , the HK - 50s . Much like HK - 47 , HK - 51 viewed his assassinations as an art form . Despite this , he was programmed to put efficiency ahead of art , though he most enjoyed it when he could have both . Unique to him , he quite enjoyed organics , as his negotiation / protocol programming was more prominent than previous models . He himself proudly stated that he was an excellent conversationalist . HK - 51 also frequently used code words so as not to give away his true nature and purpose around those who may be alarmed . He often referred his targets as " undesirables " or " troublemakers , " assassination / murder as " liquidation " or " deletion , " and those who would be alarmed if they discovered his true purpose as " polite company . " HK - 51 also often referred to a " Maker , " which seemed to be some sort of deity responsible for fate . Outwardly , HK - 51 appeared to be nothing more than an antique Systech Corporation protocol droid . This was the norm for most HK - series droids and one of the reasons for their unrivaled lethality . Abilities . HK - 51 was the most advanced HK - series droid to date . He featured several improvements and upgrades over his predecessor models . Besides being more armored and accurate than previous models , HK - 51 was far more mobile and maneuverable . He was capable of faster and more fluid motions , almost able to replicate those of organic humanoids , perform leaps , and perform combat rolls . HK - 51 also had built - in weapons and equipment : wrist - mounted micro - missile launchers and railgun , hidden smoke grenades , a stealth field generator , and the ability to repair himself if critically damaged . If all other options failed , HK - 51 was implanted with a powerful explosive which he could activate in a kamikaze attack to complete his mission . Beyond his combat abilities , the protocol functions of HK - 51 were improved , including the addition of extensive and impeccable cooking protocols . This allowed him to better disguise himself as a protocol droid . Behind the scenes . In a removed part of " " , HK - 47 would confront G0 - T0 on Malachor V , and a group of HK - 51 droids would come and help him defeat G0 - T0 , if HK - 47 had programmed them to aid him while in the HK Manufacturing Plant . ( HK - 47 could also choose to destroy them , causing him to lose to G0 - T0 . ) The HK Manufacturing Plant was also removed from the game . HK - 51 droids later made an appearance in the 2011 video game " " , as companion characters for players of all classes . At level 50 , a small quest chain in the Section X area of Belsavis leads to the discovery of the crashed Imperial battlecruiser " Fatality " , carrying a full complement of damaged but salvagable HK - 51s . To claim an HK - 51 for themselves , the player must first team up with others to explore the abandoned Czerka Corporation cruiser " Theoretika " in the Unknown Regions , and obtain a set of HK schematics . Afterwards , they must collect certain HK parts from Coruscant , Dromund Kaas , Taris , Hoth and Tatooine , from the False Emperor flashpoint on normal or hard difficulty , and either the Maelstrom Prison ( Republic ) or the Foundry ( Empire ) on hard mode . The part on the capital worlds ( Coruscant and Dromund Kaas ) requires a character of the opposite faction ( i . e . making a Republic character to obtain the part on Coruscant for an Imperial " main " ) of at least level 10 , the level around which players normally leave their starter world . After the parts are collected , the player returns to the " Fatality " wreck on Belsavis , and confronts a Sith of the Dread Host called " The Lord of Agony , " again with a group . After the Lord of Agony is defeated , the player may claim their HK - 51 . Once the HK - 51 is opened by one character , the player can open it up for their other characters using either in - game currency ( Galactic Credit Standard ) or . HK - 51 will argue with HK - 47 if the player brings him along during the battle against HK - 47 during the mission False Emperor . HK - 51 claims that HK - 47 is an inferior model , while HK - 47 defends that he is still the pinnacle of HK models .