Introduction of Secondary Elements?

More specifically,

a) When were they introduced in the story, and

b) When were they introduced in real time, ie. year?

Several of these elements were introduced by the Bohrok-Kal in 2003; with the exception of “vacuum”, each element got codified later down the line. Of course 2003 introduced Light as an element with Takanuva, and Shadow existed since 2001.

I believe the first Toa/Matoran of a secondary element (that wasn’t light or shadow) was Krakua, a Toa of Sonics, in 2005, during the events of “Time Trap”.

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