Darkest Depths Triumph Destiny 2: The Book, Not the Run
You cleared all three Oblation missions and Darkest Depths is still sitting unclaimed. Search for a fix and you get told to run a 30-minute Legendary gauntlet. That advice costs hours you do not need to spend. The Darkest Depths triumph in Destiny 2 is a single interaction with one object buried in the Moon, and this guide walks you straight to it.
What Darkest Depths actually asks you to do
Darkest Depths asks you to find something, not beat something. The in-game triumph text reads "Search within the darkest depths of the Moon," and that is the whole requirement. You travel to the Catacombs on the Moon, locate the Oblation tome on its pedestal, and interact with it. Guides and videos call it the Oblation book just as often, so the two names refer to the same object. The triumph pops on the spot.
It sits in the Monument of Triumph triumph tree under Combat, then Exotic Missions, and it pays out 20 Legendary Marks. Per Bungie's Monument of Triumph support guide, Legendary Marks are earned across a game-wide array of triumphs and spend on free armor ornaments, accessories, and weapon engrams.
The one thing standing between you and that interaction is a prerequisite, and then a walk through a genuinely confusing tunnel network.
The Oblation tome on its Hive pedestal in the Moon's Catacombs
Why most Darkest Depths guides send you the wrong way
This is the part worth reading before you commit an evening to anything.
A large share of the pages ranking for this triumph tell you it requires completing the entire Oblation mission chain on Master or Legendary difficulty inside a 30-minute timer. Some go further and state outright that interacting with the tome is not enough. That is a mix-up between three separate triumphs attached to the same mission chain.
The game's own database entries separate them cleanly. Checking the Exotic Missions triumph node on light.gg, which mirrors the live API manifest, the Oblation-related triumphs read as follows:
Cull's Shadow asks you to acquire the Cull's Shadow Exotic Fusion Rifle from the mission. Pays 20 Legendary Marks.
It's My Turn asks you to defeat the Forgemaster and loot the final reward chest. Pays 20 Legendary Marks.
Oh Worm? asks you to collect 9 hidden worms across the mission. Pays 15 Legendary Marks.
Darkest Depths asks you to search within the darkest depths of the Moon. Pays 20 Legendary Marks.
That's a New PB asks you to complete a full run before the timer expires. Pays 30 Legendary Marks.
The timed run has its own triumph, and it is That's a New PB, not Darkest Depths. The nine-worm hunt has its own triumph too, and it is Oh Worm?. Guides that fold all three into one requirement have shifted every entry one slot along.
The reward values back this up. Bungie priced Darkest Depths at 20 Marks, the same as picking up the Exotic and the same as killing the final boss. The timed run pays 30. A 30-minute Legendary gauntlet does not get costed identically to acquiring a weapon.
Worth noting in fairness: all five of these triumph entries were revised in the manifest on 13 June 2026, days after the earliest guides went up. We cannot see which fields changed, so some of that early advice may have been accurate when it was published. Either way, the text quoted above is what the entries read now.
What you need before the tome will work
Finish all three Oblation missions on their standard difficulty first: Bloodline, Soulfed, then Immolation. The chain gates itself, so each one unlocks the next. Bloodline is the mission that actually drops Cull's Shadow, so you hold the weapon well before the chain is done. The remaining catalysts come from Soulfed and Immolation.
Getting into Bloodline in the first place needs a Weapon of Sorrow equipped. Thorn, Osteo Striga, Touch of Malice, and Necrochasm all qualify. Thorn is the most reliable route because it can be purchased from the Monument to Lost Lights rather than farmed, though it still costs an Exotic Cipher and 125,000 Glimmer.
One navigation note that trips up returning players. Bungie's support guide confirms the Legends node was deprecated in Update 9.7.0, and Exotic missions now launch from the Pinnacle Ops node or the new Raids and Dungeons node. Any older guide pointing you at Legends predates this update, and that menu no longer exists. If Oblation is not showing on the Moon map, Pinnacle Ops is the place to check.
The four Weapons of Sorrow that unlock the Oblation mission chain
How to reach the Oblation tome in the Catacombs
The Catacombs are a Hive-held pocket deep in the Moon's crust. Destinypedia lists the Circle of Bones as the connecting area, which is your anchor point if you lose the thread underground.
Work through it in this order.
Spawn at Sanctuary. This is the standard Moon landing zone and the cleanest starting point.
Move through the Hall of Wisdom. Head underground rather than out across the surface.
Drop into the Circle of Bones. This is the large vertical chamber and the last named area before the Catacombs proper.
Push into the Catacombs. Reports describe both a burrowed tunnel route and a higher path, with both arriving at the same place. If you lose your bearings, opening the map or waypoint view puts a marker back on screen.
Continue to the open chamber. You will know it by the Pyramid looming in the background, which Destinypedia notes is visible from the Catacombs' inner chamber.
Stand on the Hive ritual plate. A bridge forms across the gap in front of you.
Cross and interact with the tome. It rests on a Hive pedestal in the middle of the far side. Darkest Depths registers immediately.
We have not verified this route in-game ourselves, so treat step 4 as the loose one. The plate, bridge, and pedestal sequence at the end is described consistently across independent accounts, though no wiki or official page we found documents it. What the wiki does corroborate is narrower: that the Catacombs connect via the Circle of Bones, and that the Pyramid is visible from the inner chamber.
Route from Sanctuary through the Circle of Bones into the Catacombs
What the tome unlocks once you have touched it
Claiming the triumph is only half of what that interaction does. It also adds a Customize option to the Oblation mission in the Director, with a difficulty setting labelled Oblation.
That mode stitches all three missions into one continuous run at Legendary difficulty with a 30-minute timer covering the whole chain rather than each mission separately. There are no breaks between missions and the timer cannot be extended.
Two cosmetics are widely reported as attached to this. An Exotic ship called Agony of Want is tied to Oblation completion, and an emblem called Oblation II is tied to beating the timer. Neither name appears in an official Bungie post we could find, so treat both as community-reported rather than confirmed. What is confirmed from the manifest is the triumph pair: That's a New PB for the timed clear, Oh Worm? for the nine worms.
Sources also disagree on whether running out of time hard-fails the activity or simply forfeits the reward. We could not settle that one against an official source, so plan for the stricter reading.
Why so few players have this triumph
Here is the number that reframes the whole thing. Community completion rates pulled from light.gg on 10 August 2026 show a steep and revealing drop-off across the chain.
Cull's Shadow, acquiring the Exotic, sits at 40.77% of tracked Guardians.
It's My Turn, beating the Forgemaster and looting the chest, sits at 25.35%.
Oh Worm?, collecting all nine hidden worms, sits at 5.85%.
Darkest Depths, walking to a tome and pressing a button, sits at 3.91%.
That's a New PB, the timed Legendary clear, sits at 1.92%.
Set It's My Turn against Darkest Depths. Roughly a quarter of tracked players finished the entire mission chain, and only 3.91% claimed the triumph that requires nothing but a walk afterwards. More players hunted down nine hidden collectibles than found a single tome.
These figures cover light.gg's tracked userbase rather than the whole player population, and that group skews toward engaged players, so the true rates across everyone are almost certainly lower still. The shape of the curve is what matters. Darkest Depths is not gated by difficulty. It is gated by nobody telling you the tome exists, compounded by guides pointing at the wrong requirement.
Community completion rates across the five Oblation triumphs
Clear the rest of the Oblation triumphs in the same trip
Since you are already running the chain, the efficient order is worth knowing.
Claim Darkest Depths first, before any timed attempt. It costs one walk and it is the thing that unlocks the timed mode in the first place, so there is no version of this where you skip it.
Run the worms separately from any timed attempt. The Oh Worm? triumph text sets no timer and no difficulty condition, and its completion rate sits above Darkest Depths'. That could not happen if the worms only counted inside the timed mode, because reaching that mode requires touching the tome first. This inference is ours rather than an official statement, but it points to the worms being collectable on a standard run, which is the far easier way to get them.
Save That's a New PB for last, once you know the routes cold. It is the rarest of the five by a wide margin and the only one where hesitation costs you the run.
The Hive ritual plate that forms the bridge to the Oblation tome
When the tome does not show up
Three things account for most failed attempts.
The prerequisite is incomplete. All three missions need finishing on standard difficulty, and Immolation is the one people forget because the chain does not announce itself as finished.
You are in the wrong underground area. The Moon has several Hive tunnel networks and they look alike. If you have not passed through the Circle of Bones, you are not in the Catacombs.
You are hunting for a Director entry. The tome is a physical object in the world. Nothing appears in a menu until after you interact with it.
Key takeaways
Darkest Depths requires one interaction with the Oblation tome in the Moon's Catacombs, not a timed Legendary clear.
The timed clear is a separate triumph called That's a New PB, and the nine-worm hunt is a third called Oh Worm?.
Finish Bloodline, Soulfed, and Immolation on standard difficulty before the tome will respond.
The reported route runs Sanctuary, Hall of Wisdom, Circle of Bones, then Catacombs, ending at a ritual plate that forms the bridge.
The triumph pays 20 Legendary Marks, and the same interaction unlocks the Oblation difficulty option in the Director.
Only 3.91% of tracked players have claimed it, despite roughly a quarter finishing the mission chain it sits behind.
Frequently asked questions
Do I need to complete Oblation on Master to get Darkest Depths?
No. Darkest Depths only requires interacting with the Oblation tome in the Catacombs. The triumph text reads "Search within the darkest depths of the Moon." The Master or Legendary timed clear awards a different triumph called That's a New PB.
Where exactly is the Oblation book on the Moon?
It sits on a Hive pedestal in an open chamber at the end of the Catacombs, past a gap you bridge by standing on a Hive ritual plate. The Catacombs connect through the Circle of Bones, which players reach from Sanctuary via the Hall of Wisdom.
What does Darkest Depths reward?
The triumph pays 20 Legendary Marks. Interacting with the tome also unlocks the Oblation difficulty option in the Director, which is the timed Legendary version of the full three-mission chain.
Can I get Darkest Depths without finishing all three Oblation missions?
No. All three missions need completing on standard difficulty first. The chain unlocks sequentially, so Bloodline gates Soulfed and Soulfed gates Immolation.
Is Darkest Depths solo-friendly?
Yes. The triumph itself is a walk to an object with Hive enemies along the way, which is a very different proposition from the timed Legendary run. The prerequisite missions are the harder part of the ask.
How long does the timed Oblation run give you?
Thirty minutes, covering all three missions as one continuous run rather than each mission separately. The timer cannot be extended and there are no breaks between missions.
What is the difference between Darkest Depths and That's a New PB?
Darkest Depths is the discovery triumph for finding the tome. That's a New PB is the completion triumph for finishing the full timed run before the clock expires. They pay 20 and 30 Legendary Marks respectively.
Which triumph covers the hidden worms?
Oh Worm?, which asks you to collect 9 hidden worms in the Oblation mission and pays 15 Legendary Marks. Its triumph text sets no timer condition and it is tracked as a separate record from the timed run, despite some guides bundling the two together.
Why can't I find the Oblation mission in the Legends menu?
The Legends node was deprecated in Update 9.7.0. Bungie's support guide confirms Exotic missions now launch from the Pinnacle Ops node or the Raids and Dungeons node instead.
Is Darkest Depths still available now that Destiny 2 has stopped active development?
Yes. Bungie's support guide states that Monument of Triumph remains in the game indefinitely, and the end of active development announcement commits to keeping Destiny 2 playable. Nothing here is time-limited.
What weapon do I need to start the Oblation chain?
One of the four Weapons of Sorrow equipped: Thorn, Osteo Striga, Touch of Malice, or Necrochasm. Thorn is the most reliable to obtain because it is purchasable from the Monument to Lost Lights, at a cost of one Exotic Cipher and 125,000 Glimmer.