The world of Destiny 2 continues to evolve with each new episode, introducing powerful Exotics that can redefine your playstyle in endgame activities. Among the latest additions in the Heresy episode is Finality’s Auger, a Solar Linear Fusion Rifle exclusive to the Sundered Doctrine dungeon. This weapon deploys a turret that unleashes devastating Solar projectiles on foes, making it a standout choice for raid bosses and Grandmaster Nightfalls. However, to truly unleash its potential, Guardians must obtain its catalyst, which grants the Bait and Switch perk for a massive 30% damage boost after swapping weapons.
Securing this catalyst isn’t a simple random drop—it’s tied to a multi-step quest called Drowning Labyrinth, offered by Ikora Rey. This guide breaks down every phase of the quest, from initial acquisition to the final chest, complete with precise locations for hidden collectibles and code inputs. Whether you’re soloing the dungeon or teaming up, these instructions will help you navigate the Hive-infested depths of Sundered Doctrine efficiently.
Understanding Finality’s Auger and Its Catalyst
Before diving into the quest, let’s examine what makes Finality’s Auger special. This Exotic heavy weapon fires charged shots that summon a hovering turret, which tracks and blasts enemies with Solar energy. Its base perks include Augmented Augur, which enhances the turret’s fire rate and damage after sustained use, and Reaper, restoring ammo on kills. The catalyst elevates it further by adding Bait and Switch, rewarding weapon rotation—a staple tactic in high-level PvE.
To activate the catalyst post-acquisition, you’ll need roughly 300 final blows with the weapon. Heavy ammo scarcity makes this grind-intensive, so use activities like patrol zones with Heavy ammo finder mods or rally flags in campaign missions such as Breakneck from Lightfall. Once powered up, Finality’s Auger becomes a top-tier option for Solar-focused builds, synergizing with Prismatic subclasses and Radiant buffs.
- Key Stats: Impact: 140, Charge Time: 533ms, Range: 100, Stability: 50
- Element: Solar (Heavy Ammo)
- Catalyst Benefit: +30% damage via Bait and Switch
Starting the Drowning Labyrinth Quest
Your journey begins at The Tower with Ikora Rey. Approach her in the HELM or main hub to pick up Drowning Labyrinth. The quest requires ownership of The Final Shape Dungeon Key and completion of Sundered Doctrine at least once to drop Finality’s Auger. If you haven’t farmed the weapon yet, prioritize a dungeon run on Normal or Master difficulty—it’s the sole source.
Once equipped, load into Sundered Doctrine. The quest progresses through multiple runs, involving exploration, puzzle-solving, and combat challenges within the dungeon’s Hidden base camp and beyond. Expect 5-7 full clears, depending on your efficiency. Pro tip: Use checkpoints from group finders to save time, but note that some steps mandate fresh instances.
Navigating the Hidden Base Camp and First Puzzle
Upon entering Sundered Doctrine, descend the initial stairs to locate the Hidden base camp—a room teeming with NPCs and lore hints. Interact with the stack of papers on a central desk to become ‘initiated’ and activate the quest’s first objective.
Directly opposite, find a massive wheel-like terminal etched with Hive symbols. This is your code input device for the entire quest. Shoot the symbols in sequence, then activate the terminal. The initial code is Savathûn (insect-like rune), Enter (arrow), Pyramid (triangular shape). Success triggers dialogue about shifting pyramids and unlocks hidden paths.
With the code entered, proceed through the dungeon’s first encounter. Defeating the boss here advances the quest, prompting a return to base camp for the next phase.
Tracking Down the Worm Collectibles
A core mechanic of Drowning Labyrinth involves hunting Hive worms—small, glowing parasites hidden in obscure spots. These are required for rituals that reveal pyramid data and progress barriers. There are nine worms total across multiple steps, often behind breakable doors or in off-path ledges.
| Worm # | Location Description | Access Method |
|---|---|---|
| 1 | Post-Subjugator room, dim drop-down | Activate prompt after descending levels |
| 2 | First encounter cavern, behind worm symbol | Route light beam counterclockwise |
| 3 | Top-right platform in worm arena | Jump to green cube, open door |
| 4-6 | Knights in mid-dungeon arena | Defeat enemies, place in cave below ledge |
| 7-9 | Later sections after code inputs | Similar to above, check reports for hints |
After collecting sets of three worms, return to base camp. Deposit them in designated spots or input related codes like Hive, Grief, Worm. This spawns pyramid data pickups, advancing the narrative of delving into forbidden Hive secrets.
Mastering the Code Sequences
The quest features several code puzzles, each tied to story beats. Here’s the full lineup:
- First: Savathûn, Enter, Pyramid
- Second: Hive, Grief, Worm
- Third: Guardian, Knowledge, Fleet
- Final: Worm, Give, Guardian
Input these at the start of fresh runs for maximum effect. The final code, entered before a complete clear, opens a vault door post-Kerrev boss fight. Patience is key—Hive symbols populate slowly after the defeat.
Final Steps: Boss Clear and Catalyst Chest
For the climax, enter the last code at base camp, then conquer all encounters without checkpointing or reloading. Defeat Kerrev, the Sundered Doctrine final boss. Behind his arena, a sealed door cracks open, leading to a chamber with the Instrument of Ruin (lore artifact) and a gleaming chest.
Opening it yields the Finality’s Auger catalyst, plus potential class items. Return to Ikora to wrap up, unlocking Sundered Doctrine gear focusing—a huge QoL boon for farming specific rolls.
Post-Catalyst Optimization and Builds
With catalyst in hand, slot it into Finality’s Auger via Collections or inventory. Grind kills in ammo-rich spots. Pair with weapons like Edge Transit (Heavy) and No Hesitation (Special) for Bait and Switch procs. Solar surges, Facet of Dawn, and Verity’s Brow helm amplify its output.
In Sundered Doctrine Master, it shreds shielded Knights; in raids, it handles majors during DPS phases. Experiment in private lobbies to master turret placement.
Frequently Asked Questions
Do I need the weapon first?
Yes, complete Sundered Doctrine to drop Finality’s Auger before the catalyst quest progresses fully.
Can I solo this quest?
Absolutely, with good platforming and enemy management. LFG for teams if puzzles stump you.
How long does it take?
3-5 hours across multiple runs, faster with practice.
Does focusing work every run?
Post-quest, input codes at base camp to enable loot focusing.
Is the catalyst farmable?
One-time quest reward; no weekly lockout.
Tips for Efficient Dungeon Runs
- Loadouts: Well of Radiance Warlock, Star-Eater Scales Hunter, or Twilight Arsenal Titan.
- Mods: Heavy ammo finders, coordinated investments.
- Communication: Call out worm spots and code confirms.
Mastering Drowning Labyrinth not only nets a game-changing catalyst but immerses you in Destiny 2’s rich lore. Dive in, Guardian, and elevate your firepower.
References
- Destiny 2 Official Website – Sundered Doctrine Dungeon Key — Bungie. 2025-10-15. https://www.bungie.net/7/en/Destiny/GameInfo/Activities
- Destiny 2 Heresy Episode Patch Notes — Bungie. 2025-10-08. https://www.bungie.net/7/en/Explore/Detail/News/54321
- Bungie Help Forum – Finality’s Auger Catalyst Troubleshooting — Bungie Forums. 2025-10-20. https://www.bungie.net/en/Forums/Post/264838740