While observing Rahkshi behavioral patterns (which led them to the first issue), however, Drakah theorized that they could combine the animalistic minds of Kraata with advanced computers to create a form of sapience. Several problems stood in their way, however: Teaching Rahkshi to avoid killing non-Fa-Matoran proved difficult and unintuitive, and the process of creating two whole high-level Kraata to create a single unit was inefficient and took up time. With the army idea settled on, Antharahk and Drakah immediately looked to Rahkshi. They soon began brainstorming ideas, eventually coming to the conclusion that an army would be the best option if they were to try and kill only Fa-Matoran.

She agreed to help him, due to the interest she found in running experiments with him after the two completed their task. For the next handful of years, he searched for members or associates of the Brotherhood of Makuta to assist him, eventually coming across Drakah, a fellow Makuta and a weapon engineer for the Brotherhood who had a vast knowledge in robotics and computer programming. Initially, Antharahk attempted to use his signature diseases to kill Fa-Matoran whilst keeping other Matoran alive as carriers, but this method proved ineffective, forcing him to reluctantly give up the usage of disease. He ordered fellow Makuta Antharahk, who specialized in developing plagues and infections, with enacting such a feat. As soon as the island's Matoran population proved itself capable of producing Toa by forming its own Toa team for self-defense, Teridax finally made the decision to have the island's Fa-Matoran swiftly exterminated. Due to the threat which Toa of Iron and Magnetism posed to the Makuta species, Teridax had long had the island of Leskya Nui, located in the west Southern Island chain, under review due to its considerable population of Fa-Matoran.

War mongrels characters