|Power||Channeling Elemental energy|
The Fire Sword was the tool used by Tahu as a Toa Mata. It allowed him to channel his elemental powers of Fire. When Tahu turned into a Toa Nuva, the Energized Protodermis transformed the Fire Sword into two Magma Swords. He then got it back when the Kanohi Ignika turned him back into his original form.
- The Fire Sword was originally released along with Tahu in 2001.
- A large foam weapon toy called Toa Flame Sword is based off from Toa Mata Tahu's old version of his Fire Sword; was released in 2003 and its product number was 4237161.
- A blue version of the same piece was included in the Berix set, released in 2009.
- In 2010, a new version of the sword was included with the Tahu Stars set. The same piece had been used in 2009 as part of Ackar's Flame Sword.
- In BIONICLE Heroes, Toa Jaller uses the Fire Sword as his basic weapon, which can be upgraded into Vakama's Disk launcher.