Injustice: Gods among Us Year Five #18

Enter: Deathstroke! Batman and Luthor are close to finishing a device that will open a door to another reality and bring them some much-needed assistance that could finally end this war. But they need a component that only Slade Wilson can retrieve. Can he be trusted? Meanwhile, Raven re-enters the fray, and a couple of dark gods conspire to cause trouble on Earth.