The avalanche spear was a long, spear-like weapon that served as Pouks's Toa tool when he was a Toa Hagah.1, 2 Pouks used it to channel and focus his elemental power of stone. Like the lava spear and cyclone spear, it had additional abilities, although it is unknown what they were.3
Pouks presumably acquired the avalanche spear when he became employed as one of Teridax's Toa Hagah4 (all Toa Hagah were equipped with similar spears5). When Pouks was mutated by Roodaka into a Rahaga, the avalanche spear was mutated into a small staff.6 When Roodaka reversed Pouks's mutation, the avalanche spear returned to its original form.CN Pouks presumably continued to use the avalanche spear on Spherus Magna.