Finally—trailed by the mist, trailing death—he reached the top. The end of the stairwell. There didn’t appear to be a way up to the roof from here, but he’d reached the top floor. Breathing heavily, he glanced down through the center of the stairwell—flickering electric lights illuminating broken, crumbling concrete, ripped apart as if by cannonballs. Railings twisted and covered in wreckage.