The Deterministic Chaos exotic machine gun isn’t handed to you-it’s earned through grit and precision. Here’s how to complete the Unfinished Business quest in Destiny 2: Lightfall and claim this Void powerhouse for your arsenal.
Deterministic Chaos is a Void heavy machine gun that shoots Void debuffs on every fourth and sixteenth shot. You can unlock Deterministic Chaos by completing the “Unfinished Business” quest, which becomes available after you complete the Lightfall campaign. This quest will take you through Neomuna – the neon-hued Neptune city that comprises most of Lightfall‘s campaign – to find data pieces, needed to eventually complete a mission inside of the area of the Garden of Salvation raid.
In this Destiny 2 guide, we’ll go over how to unlock the Deterministic Chaos heavy machine gun, how to find Cloud Accretions, and how to navigate the “Unfinished Business” quest.
How to start ‘Unfinished Business’ in Destiny 2
To begin the “Unfinished Business” quest in Destiny 2: Lightfall, finish the main campaign and speak with Nimbus in Neomuna. They’ll provide the opening quest step once the story is complete. From there, you’ll need to retrieve data from the archives and revisit key locations across Neomuna, including activities tied to Cloud Strider history and the Vex network. This questline sets you on the path toward earning the Deterministic Chaos Void machine gun.
You can start the “Unfinished Business” quest by completing the main Lightfall campaign. Once completed, you’ll be asked to talk to Nimbus, and they’ll give you the quest.
How to get Deterministic Chaos in Destiny 2
Complete the Unfinished Business exotic quest from Nimbus after finishing the Lightfall campaign. Follow steps like collecting Cloud Accretions across Neomuna zones such as Liming Harbor and Ahimsa Park, retrieving items from Lost Sectors, and creating chaos by defeating Shadow Legion enemies with abilities. Finish with the What Remains mission in the Black Garden, where you receive Deterministic Chaos upon defeating the boss.
The steps to get the Deterministic Chaos in Destiny 2 are as follows:
- Visit the Hall of Heros on Neomuna. This quest will open up that area at the top of the map.
- After watching the cutscene, visit Nimbus to find out why they left Rohan’s induction ceremony early.
- Collect cipher qubits from the Vex and use them to extract Rohan’s data from Cloud Accretions in Neomuna.
- Locate the final data packet in Maya’s Retreat.
- Survive the Vex attack in Maya’s Retreat and recover the data packet from their Conflux.
- Regroup with Nimbus and Osiris in Radiosonde to find out what was in Rohan’s notes.
- Retrieve a Vex compass from the Lost Sector in Liming Harbor.
- Create chaos in Ahimsa Park to draw Shadow Legion forces away from Calus’s ship. The more you use your abilities to defeat combatants, the more mayhem you create.
- The passkey’s other component is a Seed of Silver Wings. One can be found in Calus’s trove deep within the Typhon Imperator.
- Return to Nimbus in Striders’ Gate to build a passkey.
- Complete the mission “What Remains.”
- Bring the Conceptual Mind’s memory core to Nimbus in Striders’ Gate.
- Go to the Hall of Heroes to honor those who cut their years short for the sake of humanity.
Save for some combat-heavy segments, “Unfinished Business” is overall pretty straightforward. (The recommended Power level for the last mission of the quest is 1770, so be sure to gear up.) But there are some quest steps that are a bit more involved. Let’s break them down.
Where to find Cloud Accretions in Destiny 2
Cloud Accretions are the planetary material for Neomuna. They can be found all over Neomuna, but if you put on one of the “Detector” Ghost mods, they’ll be highlighted when you get within range of one.
Collecting cipher qubits from the Vex
While on this quest, any Vex you kill on Neomuna have a chance to drop a “cipher qubit.” There are high volumes of them in the Vex Incursion Zone, which rotates around the Neomuna map weekly. (You can find it on your map.) Once you collect eight cipher qubits, find a Cloud Accretion, and collect it, this will give you one of the five resources you need to extract.
Locating the final packet in Maya’s Retreat
If you track this quest, the game will direct you to Maya’s Retreat. Follow the path starting in Liming Harbor and reach the area. You’ll come across a few waves of enemies you’ll need to kill before getting the final packet.
Regroup with Nimbus and Osiris in Radiosonde
You’ll find the Radiosonde at the bottom of the Neomuna map. Head to Liming Harbor and make your way through the structure.
Finding the Seed of Silver Wings
After defeating enough enemies in Ahimsa Park, the game will direct you through Calus’s ship. This is a similar path taken during the campaign, so make your way through. You’ll reach a big room where you’ll have to activate two plates and defeat enemies before being awarded the Seed of Silver Wings.
Completing the mission “What Remains”
Deterministic Chaos best perks and god rolls
Deterministic Chaos is a fixed-roll Exotic Void Heavy Machine Gun from Destiny 2’s Lightfall expansion, so it doesn’t have traditional “god rolls” or random perks to chase. Its power comes from its intrinsic traits, which shine in add-clear and Void builds, especially with recent buffs making it competitive in endgame content like Grandmasters.
Core Perks
-
Heavy Metal: Every 4th bullet (while sustained firing) becomes a heavier projectile that weakens enemies on hit.
-
Vexadecimal: Every 4th Heavy Metal shot (every 16th bullet total) also applies Volatile, causing enemies to explode on death for chain reactions.
These make it excel at crowd control, weakening groups and triggering Volatiles for safe clearing.
Catalyst and Masterwork
-
Catalyst Perk (The Fourth Time’s the Charm): Precision hits refund bullets to the magazine, boosting sustained fire and offsetting the 48-round base mag.
-
Masterwork: Range (increases stability and handling too).
Unlock the catalyst by getting kills with it on Neomuna; it drops randomly or via playlist activities post-quest.
Best Builds and Playstyle
Pairs perfectly with Void 3.0 for Echo of Remnants (Volatile on weaken) or Fragment of Ruin (weaken spreads).
-
PvE God Setup: Volatile Rounds artifact mods + Voidwalker (Devour/Chaos Accelerant) for endless chaining; top for solo GMs or Lost Sectors.
-
PvP: Less ideal due to Heavy scarcity, but weakening shreds anchors in 6v6.
Recent updates (post-Lightfall) improved Volatile scaling, elevating it to meta status over legendaries like Commemoration.
How to get Deterministic Chaos catalyst
Deterministic Chaos has a catalyst called Fourth Time’s the Charm, which returns two rounds to the magazine after rapidly landing precision hits, greatly improving its sustained fire. Unlock it by defeating 400 targets (any enemies) using the weapon itself-this progress carries over across activities.
How to Farm It
Random drop source post-Lightfall: complete Neomuna activities like Vex Incursions, Defiant Battlegrounds, Lightfall Lost Sectors (Thrilladrome, Sanctum of the Brood, etc.), or playlist activities (Strikes, Crucible, Gambit).
-
Prime Method: Run Expert/Contest Neomuna Nightfalls or Master/Pit of Heresies-Exotics drop more often there.
-
Xûr Option: He occasionally sells it for 1 Strange Coin when rotating Exotics; check weekends.
Progress saves on kill count, so equip it in add-heavy content like Lost Sectors or Heroic Public Events. Catalyst inserts automatically upon drop.
Catalyst Impact
Pairs with Heavy Metal and Vexadecimal for endless Volatile/weaken chains, especially in Void builds. Range Masterwork recommended post-insert for stability.
