The Great Vault is the 19th main story mission in Borderlands 3 (BL3). This walkthrough will guide you through all objectives of The Great Vault Main Quest.
The Great Vault is unlocked when you complete Angels and Speed Demons.
Quest Giver: Lilith
Requirement: Complete Angels and Speed Demons
Recommended Level: 31
Reward: Money + Cosmetic item
Mission Info: Reinforcements? Check. Crazy Siren lady’s experimental technology? Double-check. Annoying bad guys to shoot? Check-a-rooney. You’re as ready to take the Calypsos down as you’ll ever be, so get it done, you know, before the end of the world.
- Return to Sanctuary
- Speak to Lilith
- Look out the window, turd farmers!
- Optional: Say goodbye to Tannis
- Optional: Say goodbye to Ava
- Optional: Say goodbye to Ellie
- Optional: Say goodbye to Marcus
- Optional: Say goodbye to Hammerlock
- Optional: Take Hammerlock’s gift
- Optional: Say goodbye to Claptrap
- Optional: Say goodbye to Moxxi
- Optional: Use one of Moxxi’s slots
- Optional: Say goodbye to Zer0
- Talk to Lilith
- Go to Devil’s Razor
- Talk to Vaughn
- Catch up to Tannis
- Clear out COV
- Meet Tannis
- Drive to Cathedral of the Twin Gods
- Follow Ava
- Shoot explosive charge
- Clear outer defenses
- Fight to Courtyard of the Damned
- Open Sanctum door
- Enter Inner Sanctum
- Kill Anointed
- Raise processing tank pressure: 0/4
- Destroy processing tank
- Drop down pipe
- Find Troy
- Kill Troy
- Investigate ECHO device
- Talk to Lilith
- Loot Vault
- Talk to Tannis
Starting Location: The Great Vault
Return to Sanctuary
Fast travel your way back to Sanctuary.
Talk to Lilith
Head up to the bridge and speak to Lilith.
Look Out the Window, Turd Farmers!
Head up to the front and, look out the window.
Optional: Say goodbye to Tannis / Ava / Ellie / Marcus / Hammerlock / Claptrap / Moxxi / Zer0
Before speaking to Lilith, head around the ship and talk to each of the crew. It’s highly recommended you do so before talking to Lilith for the rewards mentioned in the next section.
Optional: Take Hammerlock’s Gift
Hammerlock offers you a weapon as a gift from him and Wainwright.
Optional: Use One of Moxxi’s Slots
Moxxi suggests you give one of her slots a go before you leave, which you should do.
Talk to Lilith
Once you’ve spoken to everyone and have finished gearing up, head back to the bridge and speak to Lilith.
Go to Devil’s Razor
Fast travel back down to Roland’s Rest.
Talk to Vaughn
Then head up the hill one last time and talk to Vaughn.
Catch up to Tannis
Tannis has flown off ahead, grab a vehicle from the Catch-A-Ride and go after her.
Clear Out COV
Tannis needs you to clear out all the enemies in the area now so that she can work on the turrets. Hop out of your vehicle then take out any enemies up on the platform.
Once all the enemies are dealt with, head up in the building and meet Tannis outside.
Drive to Cathedral of the Twin Gods
Now that Tannis has stopped the turrets, you can head over to the travel point to go to the next area.
In the next area drive along the path all the way up to the cathedral gates.
Once you reach the gate area, follow Ava.
Shoot Explosive Charge
Shoot the explosive that Ava has placed on the door.
Clear Outer Defenses
Head inside, and take out all the enemies in the area.
Fight to Courtyard of the Damned
Once all the enemies in the first area are dealt with, you can proceed forward. Once you’re out of the tunnel you’ll come to another outdoor area, where some drop ships will bring in more COV enemies to kill.
Open Sanctum Door
Eventually you’ll reach the Courtyard, which is the area with the large flaming face.
Clear out all the enemies, then head up to the marked area to activate a switch.
Enter Inner Sanctum
Some more enemies will spawn in just to the left. Take them out then head into the door. Stop at the vending machines to sell any items and grab ammo, then proceed forward.
One Anointed enemy will drop in along with a bunch of other enemies, take them out.
Raise processing tank pressure: 0/4
There will be 4 valves around the room, interact with all of them to cut of the Eridium flow.
When you activate the first and second ones, an Anointed enemy will come out of the pool in the middle or the area.
Destroy Processing Tank
When all 4 are shut off, you can then destroy the tank behind the stream of liquid Eridium.
Drop Down Pipe
Once the tank is destroyed you can jump down the pipe.
Proceed into the next area.
Before heading through the tunnel into the final area you can hit some vending machines if you need, you’re going right into the boss fight after this.
A lot of the boss fight for Troy is dodging waves of orb projectiles he shoots out when he attacks. They come out in horizontal waves on the ground and vertical ones directly at you. Get between the spaces of them when they spread out to avoid them. When he goes immune and moves back to the front of the arena of Tyreen there will be a giant orb in the center, with lasers stretching out to four lit up boxes around the arena. Shoot those 4 boxes.
During the second phase he’ll basically repeat a combo over and over, where he jumps towards you to swing at you, then makes a pillar of fire where he lands. Then he’ll jump back to the middle and send out a few waves of horizontal orbs, then repeat. He’ll go immune again with about a third health left, then summon a large rock sword and swing that vertically at you. He’ll then go above Tyreen again and summon a large wave of rocks at you from above, which you can avoid by basically standing behind the Vault arch. He’ll come down and swing again, then go back to doing his combo. Keep hitting him until he’s dead.
Investigate ECHO Device
Now that Troy is dead, go grab all your loot from him. Then head over and pick up the ECHO device that has appeared on the ground.
Talk to Lilith
Head over to the group and speak to Lilith.
Might as well while you’re here, head inside the now opened Vault. Grab the Eridian Analyzer from inside, along with any other loot you want.
Talk to Tannis
Head back outside when you’re done and speak to Tannis to complete the mission.
This finishes The Great Vault main mission in Borderlands 3. Now the next quest The First Vault Hunter becomes available.
Next Up: The First Vault Hunter
For all other Mission Walkthroughs, check out our complete Borderlands 3 Walkthrough.