Bohrok The Bohrok are mysterious insectoid creatures from the BIONICLE storyline . They are prominent antagonists in the " Chronicles " storyline , though parts of their origin remain a mystery . Overview . The Bohrok are mechanical insectoid creatures , controlled by strange parasitic beings that live within their heads , known as Krana . If a Bohrok loses its Krana , it shuts down and can be reprogrammed to do one ' s bidding ; but if a Krana gets on another being ' s face , it then assimilates its host into the swarm . The Krana , which control the Bohrok , are in turn controlled by the two fearsome Bahrag , twin queens of the swarms . It has been hinted that the Bohrok are somehow related to the Toa Mata ; the Bahrag have referred to these Toa as the Bohrok ' s " brothers " , and series writer Greg Farshtey has confirmed that there is an unrevealed meaning to this statement . Over a thousand years ago in Metru Nui , Onu - Matoran miners stumbled upon a Bohrok nest and found that the creatures were fully mechanical while the Krana they carried inside were completely organic . They also discovered the creatures ' name , " Bohrok " , from a carving in the nest ' s wall . After a quick check , archivists found there was no evidence of assembly . Another Onu - Matoran archivist named Mavrah theorized that the Bohrok were once biomechanical ( like every other BIONICLE lifeform ) , but evolved to a state with no organic parts and without a single independent thought . History . The Bohrok were once Av - Matoran , whose destiny it was to transform into Bohrok to prepare Mata Nui for his awakening . Their purpose is to return the Island of Mata - Nui ( in reality the face of Mata Nui ' s giant robotic body ) to the before - time , to clean it ( the island appearance is actually created by the face ' s camouflage system ) . However , the Bohrok were initially awakened before the time was right by Makuta , in order to defeat the Toa . The Bohrok easily felled large trees , froze lava , melted ice , and leveled mountains in their devastating quest to " clean it all " . Relief came only when the Toa Mata defeated the Bohrok Queens , the Bahrag , in a dramatic quest . Without the Bahrag to guide them , the Bohrok became docile , and the Matoran put them to work repairing the damage . Shortly afterward , six mutated Bohrok called Bohrok - Kal were released . These elite Bohrok were much more powerful and intelligent - and independent - than regular Bohrok . Their mission was to release the Bahrag from where they had been imprisoned by the Toa Mata , thus enabling the Bohrok swarms to resume their invasion . Immediately after imprisoning the Bahrag , the Toa were transformed by energized protodermis into more powerful Toa Nuva , and each gained a Nuva Symbol that was tied to their elemental powers . The Bohrok - Kal discovered that the Bahrag ' s prison was locked by a special Nuva Cube , which required the Nuva Symbols to unlock . The Bohrok - Kal had to steal the Symbols and find the sealed entrance to the Bahrag ' s underground lair and prison before actually releasing the twin queens . The Kal managed to steal the Symbols easily , find the lair ' s entrance , clear a way in , and almost finish their devious task . While doing this , they signaled all Bohrok to leave the Matoran and return to their nests . In the lair , a group of Exo - Toa were guarding the prison ; the Bohrok - Kal defeated them easily but it gave the Toa Nuva time to catch up to them . Toa Tahu tried to use the Vahi Mask of Time against them , but even slowed to a near - standstill , the Bohrok - Kal were protected by their silver Krana - Kal . In a last - ditch effort , the Toa banked on their ties to their Nuva Symbols and fed their strength to the Bohrok - Kal , giving them power beyond imagining - too much power for them to control . Their bodies were utterly destroyed by their own powers and only their Krana - Kal remained . In the months following the Bohrok ' s defeat , the Matoran rediscovered their original home of Metru Nui and relocated there , leaving Mata Nui uninhabited . The Toa Nuva were eventually directed to a list of tasks that needed to be done in preparation of The Great Spirit Mata Nui ' s awakening . One of which , was freeing the Bohrok . Although reluctant to release such a destructive force , the Toa did as directed , and the Bohrok are now working to clean Mata Nui completely . Some of the Bohrok fought the Kardas Dragon and were destroyed . A small group of Bohrok were awakened by Krakua via a Sonic Signal in order to have them fight the Rakshi ( which were in the way to getting to the face of Mata Nui ) . Powers . All Bohrok share the abilities of curling up into a ball and ejecting their Krana onto an opponent , forcing them to become part of the swarm . Each Bohrok is also equipped with shields on their hands that allow them to fire their element ( the exceptions being Pahrak , who simply had to hit their shields on something seismic wave , and Nuhvok , who has to hit their shields on something to damage it ) . In addition , the Bohrok ' s Krana gives it an additional power , one unique to each krana , and a Bohrok can switch these powers by having a Bohrok Va exchange its Krana for another . If a Bohrok does not have a Krana , then it is immobile , as the Krana control the Bohrok movements Bohrok Va have none of these powers ( except for launching Krana ) , but , unlike normal Bohrok , they can operate independently without Krana ( though they still require direction from the Bahrag ) . They also use simple handheld tools and weapons . The Bohrok - Kal have the same basic range of powers as normal Bohrok , although they can use their element in two ways ( offensively and defensively ) , whereas normal Bohrok can only use their powers to attack . The Kal also use a set of enhanced Krana called Krana - Kal that have slightly different powers ; and when the Kal are in the final moments before completing their mission , their Krana - Kal turn silver and project a shield that protects them from all outside attack . The Bohrok - Kal have also shown the ability to merge into Kaita beings ( taking the name of whichever Krana is dominant ) , which combine and amplify the powers of those who take part in the fusion . Normal Bohrok and Bohrok Va can also do this . Bohrok Breeds . Main Breeds . Tahnok , Bohrok of Fire : Tahnok are quick , industrious , methodical , and know the value of teamwork . If another Tahnok is incapacitated , all other members of the swarm will make sure it is safe before they continue with their mission ( despite this , they are the most brash and impulsive of the Bohrok ) . Tahnok are the most aggressive of the swarms , but even though they are not naturally violent , they anger easily if threatened , and will usually strike first , and as a group . Gahlok , Bohrok of Water : Gahlok are astonishingly difficult to catch , as they can change their methods in the blink of an eye ( in fact , Turaga Nokama once said , " Catching a Gahlok is like trying to hold onto an eel with one wet hand . So think carefully before you interrupt their work . " ) . Gahlok will never react in the same way more than once , will never strike the same place twice , and are masters of ambush . At one point , they even attacked Onu - Koro , forcing the resident Matoran to evacuate . However , some good came of this , as the Matoran Nuparu used a Kranaless Gahlok body to build the first Boxor machine , and save the village . Lehvak , Bohrok of Acid : Lehvak are the most individualy motivated and free - thinking of the Bohrok , because although they do work in swarms , they definitely work best in smaller groups , and are even perfectly capable of working and thinking alone . As they are the only Bohrok with any free thought , they are the swarm ' s most dangerous tacticians . They are unpredictable , and never strike in one place for long , and it is next to impossible to predict where they will appear next . In addition to their abilities of free thought , Lehvak have the most dangerous of all the Bohrok ' s shields , as theirs gives them the power to fight with an incredibly corrosive acid , melting anything in their path . The Lehvak are also responsible for the attack on Le - Koro , the most successful attack in the entire Bohrok uprising , as they burnt the village to the ground , and infected all its members with krana , indoctrinating them into the swarm . When Toa Lewa came to assist his villagers , the Lehvak defeated him as well , and replaced his mask with a Krana . The only possible way to defeat a Lehvak is to corner a single one , and take it by surprise . Pahrak , Bohrok of Stone : Pahrak are generally placid and slow , and generally ignore attackers , unless they absolutely must defend themselves . But if they do get angry , they won ' t stop until the problem confronting them is solved . After attacking successfully , they will put it out of their minds , and return to the mission at hand . The only way to stop a group of Pahrak is to wear them down slowly , as there is practically nothing forceful enough to move them . Pahrak carry shields with sonic crumbling power . Nuhvok , Bohrok of Earth : Nuhvok are generally cave dwellers , and specialize in undermining the very foundations of Mata Nui . They are , unlike other Bohrok , quite solitary , and can usually only be found alone . They have excellent night vision , and , as they spend almost all their time underground , this more than makes up for the fact that they become highly dazzled in sunlight ( meaning the best strategy for fighting a Nuhvok is to lure it aboveground ) . Like Pahrak , they will not defend themselves immediately , and generally only when backed into a corner . However , when they do fight , they are highly dangerous , as their hammer shields can smash nearly anything . Kohrak , Bohrok of Ice , like Nuhvok and Pahrak , will never fight unless forced to . However , they consider themselves invincible and are dismissive of danger , and have , when roused , formidable fighting skills . When one Kohrak responds to an attack , the entire group does , but they will not attack as a unified force , instead fighting their opponents one - on - one . The ice shields they carry can freeze anything , even open flame . Bohrok - Kal . One of each Bohrok breed were mutated by an unknown energy into Bohrok - Kal . This energy is guessed , but not confirmed , to have been distilled from some kind of mutagenic substance such as Visorak venom . They were six elite Bohroks that were sent to free the Bahrag . Unlike all the other Bohrok , the Bohrok - Kal ( or rather , their Krana - Kal ) are capable of independent thought without the Bahrag ' s help . In addition , the Krana - Kal , unlike regular Krana , were able to speak . The Bohrok - Kal ' s purpose was to help the Bahrag if they should become unable to guide the swarms somehow . Their bodies were destroyed when the Toa Nuva , through their Nuva Symbols , fed the Kal more power than they were able to control , causing an energy overload , but their Krana - Kal are known to have escaped . Bohrok Va . Bohrok Va serve as scouts for the Bohrok , as well as carrying extra Krana for when a Bohrok loses its own . Unlike the Bohrok , Bohrok Va aren ' t controlled by Krana . Because of this , they were able to ally themselves with the Bohrok - Kal in secret , after the defeat of the Bahrag . Each of the six breeds of Bohrok has its own Va counterpart . The Bahrag . Cahdok and Gahdok are the twin Queens of the Bohrok swarms , together known as the Bahrag . They each have all the powers of the main six Bohrok breeds , plus the ability to cast illusions that seem real and solid until one stops believing in them . The Bahrag ' s powers grow stronger the closer they physically are to each other . The Bahrag are driven by a single goal , to take the island of Mata Nui and " clean it all " . They care little for anything else , unless it gets in the way of their mission . When Makuta woke them , they assumed it was time for " cleaning " and immediately sent out the swarms , regardless of the fact that there were still people living on the island . The Toa Mata tried to fight the Bahrag with their new Exo - Toa armor , but the armor proved little help as it blocked the Toa ' s use of their elemental powers . The Toa instead removed the armor and combined their elemental powers , encasing the Bahrag in a protodermic cage and ending their control over the swarms . The Bohrok - Kal were soon released to try and free the Bahrag , but they ultimately failed . The Toa ( now Toa Nuva ) eventually returned after the island had become uninhabited , freeing the Bahrag so they could accomplish their goal . Kaita . The Bohrok Kaita are large creatures created by three Bohrok merging their essences . Only two are known to exist , the Bohrok Kaita Ja , and the Bohrok Kaita Za . Neither of them have ever appeared in the BIONICLE storyline . Bohrok - Kal and Va also have the ability to form Kaita , and the Bahrag ' s parts can be combined to create the Bahrag Spider , although it is unknown if this creature is actually related to the Bohrok . Imposters . Fake Bohrok - The Brotherhood of Makuta once ordered the construction of completely mechanical Bohrok to serve their corrupt purposes . When the Matoran laborers behind the project found out , they risked their lives by sabotaging these false Bohrok . After they went on a rampage , the Toa Hagah were dispatched to eliminate them , and the Matoran were put to death for their disobedience . Fans refer to these false Bohrok as Faux - rok or Fohrok ( Fake Bohrok ) . Some Bohrok appeared in the " Maze of Shadows " video game , which took place well before the swarms were awakened . It turns out that these Bohrok were not controlled by Krana , but rather by hive - minded worm creatures that had escaped a Brotherhood of Makuta lair . They found their way into a Bohrok nest , took over some Bohrok shells and learned how to use them to defend themselves . Krana . The Krana are the parasitic creatures that pilot the bio - mechanical Bohrok bodies . They come in six different varieties , all of which have different roles , and grant their Bohrok different powers . Each Bohrok has a colour of Krana unique to it , and each of these turns a different colour when it is inactive ( not controlling anything ) . The inactive Krana are only seen on Bohrok Va , who carry them for their masters . In addition to the six basic breeds of Krana , their are also six specialized breeds , the Krana - Kal , used exclusively by the Bohrok - Kal , which look the same as the original Krana ( although they are metallic in colour ) , but are smarter , and give the wearer different abilities . The different types of Krana and Krana - Kal are as follows : The following chart lists all Krana by their colour relative to the breed of Bohrok they represent . Sets which include Bohrok . Bohrok : Bohrok Va : ( all the Bohrok Va were also released in identical sets with different numbers , as promotions from Kabaya sweets . ) Bohrok - Kal : Bahrag :