DC's epic crossover event Dark Nights: Metal is kicking off next month, and that story has been a major focus at Comic-Con this week. We had the chance to chat with writer Scott Snyder on the show floor today, and Snyder revealed some juicy new details about the Dark Knights and the ties he's building between Batman and Hawkman. Snyder reiterated the point that while Metal is an extension of his long Batman saga, it's also a story about the Justice League as a whole.