Ce-Matoran were Matoran that had a miniscule amount of Psionics elemental power in them, which gave them a natural shield against invasion of the mind. Ce-Matoran were female, and usually wore blue and gold armor. Helryx studied the Ce-Matoran in order to learn how to replicate their mental shielding. After unlocking this secret, Helryx shared this with the other members of the Order of Mata Nui.