Source :
SYFY

Life is unfair, and when it comes to the sacrifices of superheroes, true happiness is rare. In the pages of 2018's Justice League: No Justice, Oliver Queen, aka Green Arrow, was left to defend the Earth while the rest of the League went into outer space. Martian Manhunter appeased his anger by giving him a mysterious box, with a weapon that could take down the Justice League, which he kept secret from Dinah.
But at the end of Green Arrow #49, Dinah Lance, aka Black Canary, was given the orders from the government to take Oliver down because of his possession of this weapon. The two have one of the strongest relationships in mainstream comics, so pitting Black Canary against Green Arrow in the final issue is a heartbreaking tale, written by Jackson Lanzing and Collin Kelly, drawn by Javier Fernandez and colored by John Kalisz.