Also, to answer a few more of the questions, I’ll borrow a quote from another topic.
Firstly, Toa use a special kind of energy called Elemental Energy (not sure if the term itself is canon but Greg has used it so I will too). This lets them create and manipulate their element. Toa can also absorb their own element for power, but Greg has said (I’ll find the quotes later) that absorbing one’s element is unstable, and actually requires Elemental Energy to do, so they can’t just endlessly recycle it. When Vakama Metru absorbed loads of heat energy [Web of the Visorak, chapter 1], he had to release that shortly after, because he couldn’t simply turn that heat back into Elemental Energy, and his body just couldn’t contain that non-Elemental Energy within his body for long. Elemental Energy just recharges itself over time. This is why the Toa Metru didn’t use their Elemental Powers in Legends of Metru Nui, since they were drained from fighting the Morbuzahk and were still recharging. It seems like fully recovering takes something in the realm of a few days.
There are also masks that can restore one’s elemental energy, Masks of Elemental Energy. (Their appearance in Bionicle the Game is non-canon, but they’ve been mentioned in other media)
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