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Borderlands 4

Secrets of the Vault Walkthrough

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☆ How Rush Saved Mercenary Day (Bounty Pack 1)
★ 12 active SHiFT Codes as of December 4, 2025
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★ Elemental Weakness Chart
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Borderlands 4 - Secrets of the Vault

This is a walkthrough for the Secrets of the Vault, the final main mission in Borderlands 4. Read on to follow the objectives and clear the mission.

◀ Previous Mission Next Mission ▶
The Timekeeper's Order -

List of Contents

Secrets of the Vault Walkthrough

Defeat Arjay in the Vault

# Walkthrough
1
Enter the Vault
After defeating the Timekeeeper, you can enter the Vault through the giant purple portal inside the boss area.
2
Arjay Fight
You’ll immediately face Arjay in a boss fight after a brief cutscene. He has three health bars: Energy, Armor, and Red HP, along with numerous AoE attacks you must dodge and counter.
▶ Arjay Drops and How to Beat

Speak to Lilith

# Walkthrough
1 With Arjay defeated, you’ll be teleported to Lilith. In the area, you’ll also find a couple of Red Chests that you can optionally loot.
2 Explore the Vault and follow the path with Lilith, where you will encounter and speak to the Mysterious Voice. Pick up the Deodand item that the voice offers to continue.
3 Once the dialogue ends, interact with the rift to teleport back to Moxxi's Bar, completing the final main mission.

Secrets of the Vault Rewards

Red Chests

Red Chest

There are no rewards like skins or XP for completing this quest. You will, however, find a few Red Chests after defeating Arjay and when meeting up with Lilith, giving you a chance to loot Legendary Gear.

Red Chest Farm Location

Ultimate Vault Hunter Missions

With the main questline complete, you can now take on Ultimate Vault Hunter missions to unlock UVH Rank 1. With UVH toggled on, it makes combat far more challenging and offers greater rewards.

What is Ultimate Vault Hunter?

Borderlands 4 Related Guides

Borderlands 4 List of Main Missions Partial

List of All Main Missions

All Main Missions

# Main Mission
1 Guns Blazing
2 Recruitment Drive
3 Down and Outbound
4 A Lot to Process
* One Fell Swoop Shadow of the Mountain Wrath of the Ripper Queen
Rush the Gate Crystal Brawl Siege and Destroy
↓ Dark Subject Unpaid Tab
His Vile Sanctum Her Flaming Vision
15 Rising Action
16 Another Day, Another Universe
17 The Falling Wall
18 Means of Ascent
19 Plan Z
20 The Timekeeper's Order
21 Secrets of the Vault

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