Do Light stones and Heat stones run out of power?
We see Onu-Matoran mining for them
Are they doing this because they need large quantities of them?
Are they doing this because they slowly fade and need replacing?
If so can you charge a Light/Heat stone back up?
Are headstones infinite energy?
Id like to think that they fade over time and need to be recharged by being exposed to something like energized Protodermis or something, otherwise they can be used as infinite energy.