it is unknown how many robots were built, or when exactly they began to serve the Order. They were placed in the Pit in order to help Hydraxon guard the prison. When the Great Cataclysm struck, the cells collapsed and the prisoners escaped into the sea. Hydraxon had been badly injured by the earthquake and was subsequently killed by Barraki Takadox. The inmates then managed to get past the remaining robots and flee. The guards persued them and were separated as they went after their targets. Only one remained in the area around the Pit, and presumably spent the next one thousand years trying to capture the escapees that were still nearby.Shortly before the Toa Inika were transformed by the Mask of Life, Teridax floated down to the Pit in the form of Antidermis, found a Maxilos, and inhabited its body.
When the Mask of Life transformed the Matoran Dekar into Hydraxon, the new jailer began to chase down the escaped prisoners of the Pit. Unfortunately, he assumed that the Toa Mahri were fugitives as well, and so captured Matoro. He was locked inside a cave, and introduced to Maxilos and Spinax. After Hydraxon left, Teridax revealed his identity to Matoro. However, he assured the Toa that they were on the same side.
da other Toa returned to Mahri Nui, wondering where Matoro was. He soon rejoined them, explaining to them that Maxilos and Spinax were their new allies. Maxilos suggested that they split up. He and Matoro then encountered Pridak and Takadox at a Takea hunting ground, but thanks to the unwitting help of Ehlek, they were able to slip away.
Later, Teridax informed Matoro that in order to awaken Mata Nui, the stone cord connecting Voya Nui and Mahri Nui would have to be broken, even if it would kill all of the Matoran in those places in the process.
As the Toa Mahri evacuated the Matoran and engaged the Barraki in a fierce battle, Teridax came across Hydraxon, and the two began to fight. Hydraxon eventually managed to bury Teridax under a rockslide, defeating him for the time being. He later freed himself and went to stir up the main battle.
After a fight with the Barraki, the Maxilos body was badly damaged and Teridax was forced to leave it. As the situation began to wind down, Hydraxon discovered the now liberated robot and picked up its parts, and planned to repair it. However, seeing that it was beyond repair, Hydraxon decided to discard it.