Kadyx was a Matoran that witnessed the creation of the anti-shadow barrier, created by the Toa Tegen, and the renaming of Tegen Nui to Akyna Nui. She later became a Toa Akyna along with Taatoh, Atast, Dekea, Ahsia, Haddisi, Nadhoku, and Kamahn. When Makuta Venetraze broke through the barrier, he drained most of Kadyx's light, as well as the other Toa Akyna, but Kadyx electricuted the shadow leeches before they could completely drain all their light. However, Taatoh was taken to Gahru Nui, where he was made into a Toa of Shadow by Makuta Cortrivu.