B337 BIONICLE Adventures 3 : The Darkness Below Story . The Toa Metru were ready to begin their trip to the Coliseum , weak and nearly powerless after the exhausting battle with the Morbuzakh , but stopped short at the border of Ta - Metru when the Matoran named Nuparu ran up to the Toa Metru . Whenua greeted him , and took him to the side so he could listen to what the Matoran had to say . Apparently , Nuparu had discovered a leak in the Maintenance Tunnels of the Onu - Metru Archives , and the sea could gush in . This was odd , because usually the miners reinforced the walls . Whenua talked with the other Toa Metru , and they decided to all go down and investigate . Whenua , having been an Archivist before , led them to a hidden shortcut by opening a hole in the road that led to the Archives , and the Maintenance Tunnels , which were nicknamed the ' Fikou Web . ' Soon , however , they were attacked . A freak fog and the buzz of stinging Rahi led soon surrounded them , but Matau , using the little elemental power left to him , blew the fog away to reveal a Insect Control Rahkshi and a Weather Control Rahkshi . The Rahkshi challenged the Toa Metru , and the Toa began to attack them . An icy wind caused by Nuju caused the Weather Control Rahkshi to unleash a blizzard , but doing that also caused the insects to start to die , and the Insect Control Rahkshi attacked its brother . The Toa Metru used this opportunity to attack the Rahkshi , who then fled . After a small rest and talk , they proceeded , Whenua leading the way . Farther in the tunnels , a fork of six paths split them up , each going in a different tunnel to find the leak . But soon chaos erupted . Nokama was attacked by a Kraata - less Insect Control Rahkshi , Vakama blasted backwards by Nokama , Matau blown into a rock wall by Onewa with strange fire - powers , Onewa knocked down by Vakama , and Nuju running to assist Matau . They soon collided , battling each other . However , as Vakama was thrown between Nokama and Onewa ' s blasts , Nuju and Matau stopped Onewa , which led to their accusations . Realizing that Onewa said he hadn ' t seen Matau since they split , and the others saying that they had never attacked anybody , they stopped , wary and cautious . Whenua soon broke in , and heard what they were saying . Whenua told them that they had all been attacked by a fellow Toa Metru , yet not . A shape - shifter named Krahka , able to assume the voice , power , and look of anything she made visual contact with , was lurking there , and had attacked them all . They gingerly proceeded , Whenua holding a Lightstone in front . They soon came to a chasm , with nothing but a flimsy Le - Metru cable built across , and Stone Rats were swarming below that chasm . Whenua made his way across , then Nokama , and then Matau ( walking across using his hands in a supreme show of arrogance ) . Vakama then began to proceed , but a ghostly , floating Density Rahkshi suddenly made an appearance and cut one end of the bridge . Vakama fell , and holding on . He realized the Stone Rats were beginning to climb up the bridge . He used a Weakening Kanoka Disk and jammed it into the bridge . Stone Rats , Vakama , and a severed bridge plunged down , and Vakama was only saved by Matau ' s insane courage . They flew through the ghostly Density Rahkshi , but it grabbed their leg and began pulling them down . Matau flew toward a wall , turned sharply , and the Density Rahkshi instantly shifted itself so it flew through the canyon wall and out of sight . They flew to the other side , leaving only Onewa and Nuju left . Nuju hesitated , but Onewa grabbed him suddenly , and jumped across the bridge , using his Proto Pitons to swing to the ledge . If Nuju had had any power left , he would have frozen Onewa then and there . Vakama stopped him , and Whenua , without any word , hurried onward . They traveled into a dark mist , and as Nokama and Whenua led in front , the Toa Metru began to disappear . Nokama hurriedly yelled for them , but Whenua insisted they go on . Turning on him , Nokama realized something , and stood in battle stance . She realized who Whenua really was : Krahka . Indeed , she was right . The Krahka shifted into various shapes and told Nokama of her hate of ' top - dwellers , ' or Matoran . Krahka left Nokama with a silver Chain Lightning Rahkshi , a green - tan Illusion Rahkshi , and a black - white Cyclone Rahkshi . Using all of her cunning , wit and skill , Nokama took each one down , using her faded powers , intelligence , and a small leak . Nokama then went on to find the other Toa Metru , except for Whenua , stuck in some small crevices back in the cave they had disappeared in . However , Nuju was stuck in a strange stasis - field . They managed to get him out using a teleportation Disk , which teleported the stasis field , not Nuju . They hurried on , only met with a couple of Lava Eels which caused them some trouble , and then stopped to rest . Nuju volunteered to scout ahead , and as he did , found a chamber where Whenua was hanging upside down , and Nuju was trapped in a cage . He yelled to them , and then . . . Krahka reappeared . Vakama , Nokama and the other were starting to worry about Nuju . Vakama realized Krahka might set a trap if she had Nuju , so he had Matau hide . When Nuju got back , the Toa Metru told ' Nuju ' that Matau had gone off to get help . ' Nuju ' hurried to supposedly assist , but after Nokama got Nuju to say something that the normal Nuju knew wasn ' t true , Matau reappeared and pinned Krahka to the ground . Krahka just smiled , and transformed into a Lava Eel . The Toa Metru immediately let go , and had to follow her through the tunnels until she transformed once again . Wanting her to bring them to her lair , they started drilling into the wall , trying to make a tunnel out , which they knew Krahka wouldn ' t allow . And they did it loudly . Soon enough , clouds of strange , black smoke soon enveloped them and they were carried off to her lair . Dumped there , they saw Whenua hanging from the top of the cave , and Nuju in a small prison . Krahka told them they were going to stay in this room forever , and started sealing up the walls . The Toa Metru waited for a small while , formulating a plan , and then decided on something . Vakama grabbed a Kanoka disk from his pack , a Reconstitute at Random Disk , and launched it at Krahka . At the same time , Matau used some of his air power to launch himself up and grab Whenua , who had almost broken his bonds . Onewa and Nokama vaulted over to the stone cage of Nuju ' s like lightning , and freed Nuju quickly . Matau and Whenua had done a power dive toward Krahka , but she put up a wall of flames as Vakama . The real Vakama absorbed them , with what little will he had left , and then unleashed it at one of the entrances . Vakama yelled at the Krahka , calling her a thief , someone who stole other creatures might because she had none of her own . She just laughed , and transformed into a monstrous creature , a deadly combination of the six Toa Metru . She brought down the full might of their own elemental powers on the Toa Metru , who immediately spread out . However , Krahka ' s power was tiring her . Her mind had absorbed some of the memories of all of the Toa Metru , and they were mixing her up . In rage , she let loose a single beam which mixed all of their powers , forming solid Protodermis . Vakama began to stare in awe at this before pulled back by the others . They began to mess with her mind , telling her of her want for conquest , how she would end up driving all of the Rahi away , and she would be the absolute ruler of nothing . She began to expend large amounts of power quickly . Whenua began to attack and surprise her from underground . She collapsed , and Vakama , being closest , watched as she transformed into a Lava Eel and escaped once more . The other Toa Metru hurried over , asking him why he didn ' t just stop her . He simply said she was protecting her home , but in that power she was given , she became a monster . . . He saw inside her what the Toa Metru could become one day if they weren ' t careful . . . And then , exhausted but victorious , they left .