B329 BIONICLE Adventures 2 : Trial by Fire B329 BIONICLE Adventures 2 : Trial by Fire is a BIONICLE novel released in 2004 . Story . In Ta - Metru , Nidhiki nearly sends Onewa and Vakama to their death . They are caught in a chute headed right for the flames of the Protodermis Reclamation Furnace . Vakama absorbs the flames of the furnace and releases the heat in a beam which blasts through the roof of the building . Whenua and Nuju enter the wrong room while searching the Archives for the Onu - Metru Great Disk , and find themselves in the grip of a Giant Mutant Ussal Crab . They escape by chasing it off with a high - frequency sound generated by Whenua ' s drills . Nokama and Matau , searching for the Ga - Metru Great Disk , are nearly drowned when water is released into a the previously dry canal they were walking through . Nokama rescues Matau . Nokama gets the Great Disk from inside the mouth of a massive fish in the water under the Great Temple , but is chased by the fish and nearly eaten . Onewa , Vakama , and the Matoran Ahkmou and Nuhrii search for the Ta - Metru Great Disk in the Fire Pits . Vakama and Nuhrii descend into one pit while the fires it houses had died down , and retrieve the Great Disk . But Morbuzakh vines grab them on their way out . Nuhrii uses a Kanoka with the power of Reconstitute at Random on the vines ; the shock of transforming makes the vines let go . They escape , chased by a monstrous reconstituted vine , just in time before the pit ' s fires erupt again . Nuju almost releases a Two - headed Tarakava from its tank in the Archives by accident . Shortly after , he and Whenua find themselves trapped in a room with nothing in it . . . because the " room " itself is a shape - shifting Rahi . They escape after Nuju summons a blizzard , which the " room Rahi " dislikes . Whenua finally finds the Great Disk in a room stuffed with all sorts of artifacts . Matau enters a Force Sphere to retrieve the Le - Metru Great Disk , only narrowly escaping with the Disk before it implodes . Whenua and Nuju search for the Ko - Metru Great Disk . After various struggles with Vahki , Nuju finds the Ko - Metru Great Disk in an icicle on the side of a Knowledge Tower . Searching for the Po - Metru Great Disk , Vakama and Onewa encounter a rogue Tunneler . They defeat it by making it turn itself into glass , so it ' s too fragile to move without shattering . Onewa gets the Great Disk from the top of an unstable statue , narrowly avoiding being crushed by it . With all of the Great disks found , the Toa meet up . Vhisola reveals how to defeat the Morbuzakh - the Toa Metru must find the King Root . Nokama realizes the King Root must be in the Great Furnace . On the way to the King Root , the Toa Metru encounter and escape from hundreds of Morbuzakh seeds . Ahkmou tries to run . Onewa realizes he was definitely the traitor , and confronts him about it . In the hallway leading to the Great Furnace , Nuju uses up most of his elemental power trying to defeat several vines blocking the way . Then the Toa and Matoran are nearly defeated when hundreds of thorns are shot at them . Nuhrii , Tehutti , Orkahm , Vhisola , Ahkmou , and Ehrye form a Matoran Nui , and this merged being helps the Toa escape into the main chamber . The Matoran , then separate , flee the building . The Toa enter the Great Furnace . They see the King Root , as tall as a skyscraper , filling the massive room . The King Root speaks telepathically to the Toa , revealing that it was commanded to drive the Matoran to the center of the city . It tries to steal Whenua ' s Great Disk , but fails . During the battle , the Toa Metru each use up almost all of their Elemental Power ( it would later take quite some time to recharge due to their inexperience as Toa ) , and trick the Morbuzakh to draw them in closer to it . They then launch the Great Disks , which form an energy bubble around the King Root , cutting it off from its vines , and killing it . The Toa Metru retrieve the Great Disks , and flee as the building collapses . The vines in the city disintegrate . The Toa have been victorious . . . but Nokama wonders who could have commanded the Morbuzakh , and whether that person would strike again .