While the Toa of Sound, Tapio, Henkka and Aino went in Tonga's Fortress and searched for Tonga, they encountered the Zaxx. Toa of Sound stood to hold it off while the others found Tonga. The battle was long and hard but eventually the Toa of Sound was able to slay the Zaxx. This happened at the same time as Tonga was defeated by the others.