The air sword was a curved, bladed weapon that served as Toa Lesovikk's Toa tool.1, 2 Lesovikk used it to channel his elemental power of air. It did not have any additional abilities.3
Lesovikk somehow lost this sword while pursuing Karzahni in Bara Magna. It was apparently taken by Velika and used to murder Karzahni in Iron Canyon, where Pohatu and Kopaka found it. It is unknown what became of the air sword after this; it may have been brought back to the Agori/Matoran camp in Bara Magna with Karzahni's body.4