No, it must be artifacts. I based this on LotR and other High Fantasy, the world is actually destroyedin the last book, by means of a natural disaster. What I mean is, the plot doesn't reolve around stopping the bad guy, he's just the general of some army under commands from a captain who finds the main guys guarding the lamp at the end. He doesn't appear before this happens.
By the way, when I meant the bad guy will destroy the Earth, I meant he will open the lamps, the Immortals will see him, when he tries to control them, they'll get angry and blow the world up. The world's danger is not an immediate threat until the end.