this is a theory about the skull spiders: the skull spiders where secretly created by makuta before he created the mask of ultimate power. after Ekimu had defeated makuta the skull spiders came from a hidden chamber and the lord of skull spiders could be makuta's pet. so then the 6 masters (Tahu Gali Lewa Kopaka Onua and Pohatu) don't know is that makuta was the one who created the skull spider army in the first place.