Because it's the chosen instrument of the Necessity of the Universe.

[ Which is something he's never exactly consciously thought since this moment, never entirely put into words. It's something he knew, but all the same... ]

And no, I don't know what that means. At least not in that context. I know that there's a sort of buzz you can get from walking across a carpet and touching to metal, and my grandfather used a word like that to describe it to me... but-

[ He pauses as he puts some things together. ]

So you can build up large stores of that spark energy, perhaps as much as would be in a lightning bolt, and use it towards a purpose?