The Tempest Ninjas : Mistresses of the Thousand ways of Death.
After the Rahkshi threat emerged, Mata Nui was in need of a bigger force. Bigger than the Toa Nuva.
Hikage, Lonely Vision's fourth incarnation, summoned a group of warriors to aid the Toa Nuva on their quest. What made them so questionable was that they were the most beautiful princesses to grace Mata Nui since the Child of Oceans Gali.
Despite their appearances, though, they came to be more deadly than they seemed and developed a rivalry with the Toa Nuva after Hinoarashi and Lewa Nuva had a small misunderstanding that erupted into fierce competition.
Kurayami, Tempest Ninja of Shadow, is the leader of the trio. With her Shadow Katana she is able to create darkness with a skillful swipe, and with her ability to slip from one shadow to another, she is the most deadly of the Tempest Ninjas.
Hinoarashi is the Tempest Ninja of Flame, counterpart to Tahu Nuva, Toa of Fire. With her blades she can summon flames from the sun itself, making her a very formidable foe. And with her short temper and anger management problems... she's quite the dangerous one.
Kasumi is the Tempest Ninja of Mist, counterpart to Gali Nuva and by far the calmest and most shy out of the three. She is able to turn into mist, enabling her to surprise her enemies. Her blades are very sharp; so sharp that she can seperate all forms of evaporation (fog, mist, clouds).