sub-zero spear

The sub-zero spear^{note 1} was a long, spear-like weapon that served as Kualus's Toa tool when he was a Toa Hagah.^{1, note 2} Kualus used it to channel and focus his elemental power of ice. Like the lava spear and cyclone spear, it had additional abilities, although it is unknown what they were.²

Kualus presumably acquired the sub-zero spear when he became employed as one of Teridax's Toa Hagah³ (all Toa Hagah were equipped with similar spears⁴). When Kualus was mutated by Roodaka into a Rahaga, the sub-zero spear was mutated into a small staff.⁵ When Roodaka reversed Kualus's mutation, the sub-zero spear returned to its original form.^CN Kualus presumably continued to use the sub-zero spear on Spherus Magna.