Krahka The Krahka is a BIONICLE combiner model introduced in 2004 . It can be built from the pieces of all Toa Metru sets . The instructions for this model were originally only available from the last pages of the book , however this version was coloured black and white , making it hard to discern the colours for a specific piece . The book later provided an image of Krahka with the actual colours . History . The first known encounter with Krahka was when the Toa Metru had to go deep into the Archives and fix a leak that was threatening to flood the Archives . After the Toa had entered the Archives , Krahka quietly stalked them , watching them fight , and attempting to learn their language . Krahka ' s first contact was with Nokama . Taking the form of an Insect Control Rahkshi they had battled earlier , she unleashed a swarm of Fireflyers at Nokama , and knocked her unconscious . Krahka assumed the form of Nokama , and proceeded to challenge Vakama . At first , she was unable to speak Matoran , and could only mimic the words spoken to her , converting them into fragmented sentences and short answers . After a brief conversation , Krahka attacked Vakama with jets of water , pinning him onto the ground . Having defeated the leader , she assumed his form and attacked Onewa , using Vakama ' s fire powers to defeat the Toa of Stone . She then confronted Matau , now in the guise of Onewa , and brought a wall down on Matau , along with assaulting him with Vakama ' s fire power . Krahka then attacked Whenua and trapped him in her lair , converting into his form . However , instead of another attack , she instead assumed his place in the team , using her better developed speaking skills to guide the Toa Metru through the Archives . After a long trek through the Archives , the group entered a tunnel of shadow and were ambushed by Rahkshi . Taken unawares , the team was captured and hidden , save Nokama and Krahka . Nokama grew suspicious , and , noting the lack of concern about her missing teammates from " Whenua " , Nokama realized that it was actually Krahka , and attacked . Krahka , however , unleashed the three Rahkshi in the tunnel on Nokama . After a fierce battle , Nokama emerged victorious , and saved the other Toa , minus Whenua . The group then went in search of Whenua . Nuju offered to scout ahead in a tunnel the group was about to travel through . At the end of the tunnel , Nuju found Whenua trapped on the ceiling of the chamber . Nokama entered the chamber and asked Nuju to guard the exits . Nuju realized too late that it was Krahka in disguise , and was encased in a stone cocoon by Krahka , in the shape of Onewa . Krahka exited the chamber in the form of Nuju , and returned to the other Toa Metru . However , she was deceived by the Toa , who had anticipated her return , and trapped . The Toa Metru demanded that Krahka to lead them to where Whenua and Nuju were held , but Krahka refused and disappeared . She then transformed into a creature of smoke , transporting and dumping the Toa into the chamber where Whenua and Nuju were held . After a brief conversation and shifting through the Toa ' s forms , she transformed into a huge amalgamation of all six to fight with . However , the powers of the six Toa were too much to bear , and caused much strain on her being . In the course of an intense battle , the Toa defeated her , using her own lust for power and gigantic form against her . She transformed into a Lava Eel , and headed toward a puddle of molten Protodermis , passing by a hesitant Vakama and escaping . Several months later , the Visorak arrived in Metru Nui , conquering the city , covering it in webbing , and mutating many of it ' s creatures . Krahka was disgusted by this , and attempted to kill Roodaka , the Viceroy , in a duel , but lost . As punishment for losing , Roodaka insisted she seek out and uncover the signs that pointed to the undestined Toa . Krahka later encountered Onewa and Pouks in the Archives , knocking the latter unconscious . However , after talking with Onewa , she agreed to help them fight against the Visorak . She , Onewa , and Pouks found the Tahtorak , and rode it into the city to the battle . While the Tahtorak clashed with the giant Zivon , the Toa and Krahka combatted the Visorak . Near the end of the fight , she was sucked into the Field of Shadows by a Kahgarak ' s Rhotuka , along with Tahtorak , sacrificing herself to contain the Zivon . One thousand years later , Krahka and Tahtorak returned through a dimensional gate created by Brutaka ' s Olmak while he tried to defeat Axonn . Teridax ' s Reign . Later , after Makuta Teridax took over the Matoran Universe , the Turaga of Metru Nui found the Krahka in the Archives , whom she agreed to ally with once more . She informed the trapped Toa and Turaga of tunnels which led to a shoreline , where they could attempt to steal a boat and communicate with Toa of other lands . Later , she left Metru Nui and joined up with a team of rebels including Tahu , Kopeke , Johmak , Guardian and Lariska . While camping in the ruins of Karzahni , the group was ambushed by a squad of Exo - Toa , and Guardian was killed by Teridax . Teridax informed them that they were to return with their robot captors to Metru Nui or die . Moments after this , Toa Onua destroyed the Exo - Toa and saved his friends . Krahka is now journeying with the team , plus Onua , to the Order of Mata Nui base on Daxia to cut off Teridax ' s supply of Energized Protodermis . " Dark Mirror " . In a pocket dimension Takanuva and Takua went looking for the Krahka , as Takanuva hoped that because she helped Toa in his universe , that she would help him in this dimension . However , before they could find her , they were intercepted by the Brotherhood of Makuta , who sought Takanuva ' s help in their war against Toa Tuyet . Abilities and Traits . Krahka has the ability to copy the form and power of anyone she has seen , and even merge forms together . Because of this ability , she is the only being capable of creating a Toa Seal other than Toa . Krahka has a very distinct personality , considering she is a Rahi . She is very defensive of her territory , and will protect it at any cost . Being much more intelligent and gifted than other Rahi , she was also much more capable of protecting herself from the Visorak than most other Rahi during the Visorak invasion .