[She nods.] That's right. And I don't see what he ever shared... besides suffering.

[Katara leans forward and places her tea cup on the table. Suddenly, she doesn't have much of an appetite.] Eventually, Sozin found a way around Roku, and Roku died. [That part of the story is horrible and private and she doesn't want to share it with anyone, just in case. Her voice lowers.] Twelve years past as Sozin built his army and made his plans. And on the day of the comet, when the firebenders' power was doubled... he attacked and slaughtered every Air Nomad in the four temples. Any other remaining airbender was hunted down. Before we found Aang, it had been a hundred years since anyone had seen an airbender.

And that was just the beginning.