Dark Nights Metal
Dark Nights: Metal was a monthly comic book published by DC Comics that began in June 2017 and lasted until April 2018. Dark Nights: Metal is part of a larger crossover storyline, which include the eponymous six-issue core miniseries, and a number of tie-in books. The plot was written by Scott Snyder, with art by Greg Capullo, Jonathan Glapion and FCO Plascencia. The story closely links with Snyder and Capullo's run on Batman during The New 52 DC relaunch.
The story involves Batman discovering a dark multiverse that exists beneath the core DC multiverse. It is revealed that both multiverses are connected through mysterious metals that Batman has encountered over the years. His investigations eventually result in him releasing seven evil versions of himself from the dark multiverse, led by the dark god known as Barbatos, who plans to unleash darkness across every Earth.