To truly beat Suicide Squad: Kill the Justice League, you need to start collecting some Promethium in order to take on the toughest challenges in the game. Luckily, earning some is easy if you know where to look, and I’m here to point you in the right direction.
How to Earn Promethium in Suicide Squad: KTJL
Promethium is earned by completing missions such as Giant Gun Fun around Metropolis after you defeat the Justice League. If you just finished fighting Superman, then there are only three missions you can do to collect more of the new currency. One is the Giant Gun and the other two are based on taking down the terraformers that spawned from the skull ship.
Each of the three missions will provide you with 1,000 Promethium in Suicide Squad: Kill the Justice League. So you eventually end up with 3,000 which will let you reach the final mission in the main story. Make sure you have some decent gear with you before you plunge into the first Elseworld mission against Brainiac.
After Brainiac has been dealt with, there are more ways to earn Promethium and more ways to use it. The other versions of Brainiac are withheld until more content is released during the seasons for Suicide Squad, but there are missions such as Mayhem that you can complete in Elseworlds. They all require Promethium to start and they progressively get more difficult.
Post Brainiac Metropolis has more standard side missions that provide you with smaller doses of Promethium. You can easily complete the smaller gigs or look around for more of the Giant Fun Guns for a larger boost. Either way, grinding out that Promethium is the name of the end game in Suicide Squad: Kill the Justice League.
Don’t forget to start earning more outfits to keep your squad in style before the final gameplay loop.