Suicide Squad: Kill the Justice League Endgame Guide – How to Farm Incursions, Promethium and More

The endgame is where many players will spend their time. Here's how it works, from Mastery Tiers and Invasion Levels to Mayhem.

Posted By | On 05th, Feb. 2024

Suicide Squad Kill the Justice League_05

For a live-service looter shooter, Suicide Squad: Kill the Justice League doesn’t have much of an endgame. Nevertheless, hitting level 30 and unlocking Invasion Level 1 is only the start. Here’s everything you should know about the endgame when starting.

Incursion Missions

You have three Incursion Missions, which send you to an alternate Metropolis. The entry is 1000 Promethium, but we’ll get to that. When entering an Incursion, you can select the difficulty. At first, only Notorious weapons and gear will drop. As you complete higher difficulties on each Incursion, Mastery Tiers become available.

These bump up the XP and resources earned while adding Infamy Sets (themed on Bane) to the loot pool. There are 24 Mastery Tiers in total and three Tiers of Infamy Sets. As the difficulty increases, enemies become deadlier, with Mutators entering the mix. For example, enemies will heal when dealing projectile damage to you and have a chance to morph into stronger foes.

You’ll only get so far with random Legendaries and Notorious gear, so Infamy Sets and Villain Synergies (which occur when an Infamy and Notorious item interact) become more valuable. The higher Tiers offer better bonuses, so it’s worth pursuing them. Note that Master items can drop from higher Mastery Tiers in Incursion Missions, though they’re at the top-end of the min-maxing and not mandatory for endgame farming.

How to Get Promethium

Unfortunately, you need Promethium to access Incursion Missions. It can drop from Red Cargonauts in Metropolis for completing Contracts, opening Caches scored from destroying Carrier Drones, side missions, Support Squad missions and the Killing Time mission that unlocks at Rank 15.

Killing Time is essentially Horde Mode. You’re transported to the same alternate Metropolis and can roam freely to kill enemies. Every enemy killed adds more seconds to the clock while raising the Mastery Tier and the difficulty. In the regular version, you retreat to the portal once the timer runs out. The Hardcore version lets you leave anytime, though there are no revives. If you want to spice things up, Killing Time is worth playing, though you need 500 Promethium to start it.

Support Squad Missions

When you’ve beaten the story, the Support Squad will have several new missions available to unlock further features. Poison Ivy can Supercharge Afflictions, ranking them up for more damage; Penguin can craft Legendary, Notorious and Infamy loot; Hack provides slots for Contracts; and Toyman adds more Augments to his reroll pool (along with an option to Elite a weapon, allowing for modifying all Augments on it freely instead of just one). It’s worth wrapping all these up but beware: They have some tedious modifiers, the worst being to kill enemies with Shield Harvesting strikes and Counter-Shots.

Mayhem Mission

As you complete Incursions at higher Mastery Tiers, the Finite Crisis Rank also increases. At Rank 30, you can take on a Mayhem mission, a rematch against the final story boss. You can select the difficulty, leading to higher quality drops, and it’s not a bad way to farm loot since it usually pays out about seven pieces of gear (potentially more). However, it costs 3000 Promethium to enter, and you need to fight one of the most annoying bosses in the game. Nevertheless, if you want to focus on loot, then it’s an option. Play with others because it’s a pain solo.

Invasion Levels

Completing the story unlocks the first of five Invasion Levels. These provide more even XP and resource gain in exchange for Metropolis becoming more challenging. Earn XP to unlock further Invasion Levels, which increase the amount of XP and resources earned while allowing Infamy items to drop in Metropolis activities. You can also unlock Legendary crafting recipes.

Squad Talents

Past level 30, any XP earned goes towards your Squad Level, which is like Diablo 3’s Paragon system. You get points for each subsequent level up to invest in more weapon damage, critical hit chance, shield capacity, etc. Further options become available at higher levels (which take your base level and Squad Level into consideration). You can respec these points at any time for no extra cost, and they provide decent bumps to your overall power.

The endgame loop boils down to farming Promethium and playing Incursion or Mayhem missions. You can intersperse Contract completion, side missions, Killing Time, rerolling Augments and Squad Level points throughout. Raising Hell, another list of objectives gives a piece of loot, currency and resources on completion. It also sends laughable “Hit Squad” after you.

Suicide Squad: Kill the Justice League is available for Xbox Series X/S, PS5 and PC. Check out our review here.


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