Metanecrons The Metanecrons were an army of mutated cyborgs — technobeast s — formed by the Dark Lord Belia Darzu during the New Sith Wars . Using Sith alchemy and " mechu - deru " , Lord Darzu created this army by means of a technovirus called the nanogene spore . Contained inside a hidden stronghold on the planet Tython , living victims from a number of different species were assimilated into the Dark Lord ' s forces . As the leader of a resurgent Sith faction , Lord Darzu unleashed her technobeasts upon the Galactic Republic and the Jedi during the Sictis Wars . At the end of this period , the assassination of the Dark Lord ended the creation of the mutated hybrids , sabotaging her cyborg army . Centuries later , the remaining bulk of Darzu ' s technobeasts dwelled inside her fortress on Tython , only to be wiped out at the hands of the Sith Lord known as Darth Bane . History . Sictis Wars . In 1250 BBY , a female changeling known as Belia Darzu had assumed the mantle of Dark Lord of the Sith , becoming the leader of a resurgent Sith faction operating during the Draggulch Period . Around this time , Lord Darzu used a hidden fortress on the planet Tython to experiment with the creation of part machine , part organic hybirds called technobeast s . Exploring Sith alchemy and the Force technique of " mechu - deru " , Dazu concocted the nanogene spore , a technovirus capable of irreversibly transforming living victims into the Sithspawn mutant s . Inside the fortress of Tython , living subjects from a number of different species were exposed to the effects of the virus , including humanoids , rancors and banthas . Victims of the nanogene spore were assimilated into an army of technobeasts known as the Metanecrons . The technobeasts of Belia Darzu were designed for combat , possessing arm - mounted saws and skewers , as well as blaster cannons and armored hides . In addition , the creatures were capable of dispersing the nanogene spore itself , infecting other victims with the virus and spawning additional hybrids as a result . Imbued with the power of the dark side , the technobeasts were bound to the will of Belia Darzu and housed inside the barracks of her fortress . The Metanecrons formed the frontline of the Dark Lord ' s forces during the Sictis Wars , a two - decade subset of the New Sith Wars . In this period , the technobeasts were unleashed upon the Galactic Republic and the Jedi Order , becoming recognized as the defining threat of the Sictis Wars . By the final year of this period , Darzu ' s army was sabotaged following her assassination at the hands of the secretive Mecrosa Order , ending the creation of her Sithspawn hybrids . Remnants . Centuries after Belia Darzu ' s death , the remnants of the technobeast army continued to inhabit her fortress on Tython . In the absence of their creator and leader , the mutants wandered aimlessly throughout the halls of the stronghold . During this time , the creatures fell victim to the long - term degradation caused by the nanogene spore , becoming dilapidated and dysfunctional . In addition , they were drawn towards the dark side energy radiating from the holocron of Belia Darzu , the final vestige of the Dark Lord ' s power . Compelled by a primal urge to obey their mistress even after her death , the technobeasts congregated around the holocron within the underground inner sanctum of the fortress . In 990 BBY , the remnants of the technobeast army were encountered by Darth Bane , a Sith Lord who sought Darzu ' s holocron for the secrets to constructing such a device of his own . While the creatures initially ignored Bane , they immediately turned against the Sith Lord when he attempted to seize the holocron of their deceased mistress . While swarming against Darth Bane with superior numbers , the mutated cyborgs were unable to break the defenses of his orbalisk armor . In addition , their attempts to infect the Sith Lord with the nanogene spore were thwarted ; the orbalisk parasites on Bane ' s armor purged the virus from his body . Despite their relentless aggression , the remnants of the technobeast army were eventually wiped out by Lord Bane . During the era of the Yuuzhan Vong War , the technobeasts of Belia Darzu were briefly mentioned in " " , an essay written by Jedi Knight Tam Azur - Jamin . Behind the scenes . The technobeasts of Belia Darzu were first mentioned in an adventure seed — " The Lost Art " — featured in " The Emperor ' s Pawns " , an article published in 2001 . Despite this , the creatures remained unnamed and unaffiliated with Darzu at the time . The technobeasts and their association with Darzu were later identified as such in " " , a article released in 2005 . In a subsequent article called " " , the technobeasts created by Belia Darzu were referred to as " the Metanecrons " . The technobeast army made their debut appearance in " " , the second adaption of the " Darth Bane " trilogy .