|Former Residents||Nuurakh, Ta-Matoran|
Nearly 80,000 years before the death of Mata Nui, when the Matoran went to war with each other, the different Metru formed alliances. Eventually, the Brotherhood of Makuta intervened and ended the fighting, and the hostility between the Metru dissolved.
It was filled with factories and forges, which were used to mold and manufacture Protodermis sent from Ga-Metru. The Protodermis was then shipped to Po-Metru and Le-Metru, but some remained in Ta-Metru so they could make Kanoka and then Kanohi out of Kanoka. The Vahki that protected this Metru were Nuurakh, but they were all destroyed during the Great Cataclysm, those few Vahki that did survive were vanquished later by the Visorak. The Great Furnance was sabotaged by the King Root in the conflict of the Toa Metru vs. the Morbuzahk.
Vakama called the the time just prior to the the Toa Metru "The time of my kind; the Mask Makers." Kanoka disks and Kanohi masks were in incredible demand, and the greatest mask-makers (such as Vakama), were swamped with orders and contracts from all over the city. The most exceptional of the craft received contracts from Turaga Dume himself.
During the Great Cataclysm, Ta-Metru was destroyed along with the Vahki and the rest of the city. Ta-Metru was soon covered in webs and made into the home of the Vohtarak after the Visoraks' conquest of the city. On the return of the Toa Metru to collect the remaining Matoran and Vakama's treachery, he was shown the damaged district by Roodaka. Ta-Metru, with the other parts of Metru Nui, were repaired 1,001 years later by the Staff of Artakha and was reinhabitated by its former residents. Once Spherus Magna was reformed, Ta-Metru was again abandoned.
- Great Furnace
- Protodermis Reclamation Yard
- Protodermis Reclamation Furnace
- Fire Pits
- Nuhrii's Home
- Vakama's Forge
- Vat Control Room