Jesse Turner was an average eight years old boy. Well, except, you know, the technical bit where he's the son of perdition, the Antichrist, the bringer of the end. But see here, the thing of it was, he didn't want the world to end. In fact, he doth firmly protest against the apocalypse, the cataclysm, the ekpyrosis, the great big armageddon, or whatever it was called in your corner of the world. So, you know, being your typical half-human half-demon entity of unfathomable power, he decided at a pivotal moment in the final battle between Heaven and Hell that he had had enough. He just wanted things to go back to a simpler time, when the proverbial crap hadn't hit the fan.
...All the way back to the ages when princesses needed rescuing, damsels needed saving, dragons needed slaying and witches needed burning.