Kaisira was an Av-Matoran before she was taken captive by Makuta Teridax and was forced to wear an infected Kanohi and was also infected by Shadow leeches causing her to become a Shadow Matoran. Kaisira later became the Toa of Void, a corrupted form of a Toa of Light. However, she was later purified around after the Matoran Universe collapse (and almost everyone migrated to Spherus Magna).