Matero is a Toa of Ice.
Out of the Toa Cierik, Matero's history is the best known. He was a Ko-Matoran scientist/inventor, who made many weird inventions. One went wrong, and turned him into a Toa.
As a Toa, Matero kept making inventions.
- Matero is the only Toa Cierik who didn't become a Toa by unleashing the power of a Toa Stone.