When the sun comes up, it's not just the moon that's up in the sky. It's also the "hypogean" , who's trying to take over the world. The narrator tells us that he's pretty sure that the sun's going to destroy everything in its path. He's got a pretty good idea of what that means, though. He figures that if the sun doesn't destroy everything, he'll still be able to use the light of the moon to his advantage. So, yeah, he figures that he can use the sun to destroy the world as well.