“Once upon a time, long long ago, there was an evil kind that ruled this part of the galaxy. They did not choose to be evil, mind – they were made to be that way.

And so they were, marauding across the galaxy. They consumed innumerable civilisations, quashed innumerable histories. That was what their purpose was.

Now, young ones. You might notice that this part of the galaxy is ruled no longer by an unstoppable despoiling force. What became of this kind?”

The instructor paused for a moment, and heard the children's answer.

“That's right. They were us. Life cannot be so easily bound to a purpose. Time weathered down the force of this evil, until a lone hand reached out in friendship broke a barrier that even the ancients could not.”

Another pause. A question from the audience.

“Yes. It is said that Kith-Toph returned in kind the kindness that was shown to her, and gave the gift of hand-holding to Lightning and her dearest Thea. But that is not part of your curriculum. Please turn to slide 159, where we'll continue…”