One of the unique aspects of Justice League: Warworld is how the concept of Warworld has been tweaked. In the comics and cartoons, it's usually depicted as a cosmic gladiator arena. Heroes and villains would be imprisoned and forced to fight each other -- something Justice League Unlimited brought to life. In Young Justice, it was even turned into a Death Star, leaning more its other purpose as a roving destroyer. This film changes things up a bit.
Source：https://www.cbr.com/justice-league-warworld-batman-warlord/
