Toa of Shadow was a title given to Toa who had had all of their moral Light drained out of them, allowing them to wield the Element of Shadow. As Matoran of Shadow did not occur naturally in the Matoran Universe, a Toa of Shadow was impossible to create until the Makuta created Shadow Leeches. After that, Toa of Shadow could be created either by finding a Matoran destined to be transformed into a Toa, draining their moral light, and exposing them to Toa Power, or by finding an existing Toa and draining their light. Should a Toa of Shadow fulfill his or her destiny, they were given the option of sacrificing their Toa Power and becoming a Turaga of Shadow.