Bionicle: Mask of Light (2003) on Netflix

In the robotic Matoran tribe from the island of Mata Nui, which is protected by six powerful guardians known as the Toa. Two small Matorans--one a potentially heroic "herald" and the other a historian-witness called "chronicler"--find a sacred mask of light, suggesting the imminent of arrival of a seventh Toa. Identifying that mystery figure proves difficult, however, especially with the evil spirit of shadows, Makuta, attacking Matoran with serpentlike warriors called Rahkshi in a bid to possess the precious Mask of Light.