What to know

  • Fortress Indomita contains 2 Vault Symbols hidden as collectibles in Borderlands 4.
  • These symbols provide SDU Tokens that upgrade inventory and ammo capacity.
  • The Vault Symbols are located in secret or hard-to-reach areas like vents and high ledges.
  • Gathering the symbols contributes to region completion and rewards.

Borderlands 4 invites players to explore vast areas filled with challenges and hidden treasures, and Fortress Indomita is no exception. This imposing location houses Vault Symbols—mysterious glyphs that reward players with valuable SDU Tokens used for upgrading gear capacity and ammo. Knowing the exact locations and how to reach these symbols can enhance the gameplay experience and reward completionists.

Where to find Vault Symbols in Fortress Indomita

Fortress Indomita has two Vault Symbols, each tucked away in unique spots requiring exploration and some platforming skills.

Vault Symbol #1: 

This one is hidden inside a secret room accessible via a vent. Players need to locate a vent cover in the fortress and crawl inside to find the symbol etched on the wall. This room is usually accessible during or after the main quest objective involving the fortress.

Vault Symbol #2:

Found on a high ledge behind some trees and branches. To reach this symbol, navigate to a middle walkway with a broken bridge, then jump onto a railing to reach a platform covered with greenery and hanging vines. From here, ascend to the next platform and move behind the tree to access the Vault Symbol.

How to collect both symbols (step-by-step)

Here’s a walkthrough to make sure neither symbol in Fortress Indomita is missed:

How to get Vault Symbol #1

Step 1

Progress in the Rush the Gate main quest until the “Kill Idolator Sol” objective.

Step 2

Locate the grated area that can be opened (via grapple). Pull the grate down.

Step 3

Enter through the vent that’s revealed behind that grate. Go through it to reach a hidden room.

Step 4

Inside that hidden room, find the Vault Symbol placed on one of the walls. Collect it.

How to get Vault Symbol #2

Step 1

Locate the middle walkway with a broken bridge within Fortress Indomita.

Step 2

Carefully jump onto the railing next to the walkway.

Step 3

From the railing, double jump onto the platform above, which is covered in foliage and vines.

Step 4

Keep climbing to the next platform and move behind the tree to find the Vault Symbol.

Things to watch out for

  • Some sections may require using the grapple tool or special movement mechanics, so make sure those are unlocked.
  • The environment around vending machines or ledges may have enemies or hazards—be prepared.
  • If you miss one, you can return later since the area is accessible after many objectives; the symbols aren’t completely locked out once you pass the main quest points.

How Vault Symbols impact gameplay

Each Vault Symbol collected grants SDU Tokens, which are crucial for upgrading essential gameplay elements such as the player’s ammo capacity and inventory slots. Collecting all Vault Symbols in an area contributes to the region's completion percentage, unlocking further rewards and achievements.

Finding both Vault Symbols in Fortress Indomita is straightforward if paying attention to environmental cues (grates, vents, ledges). No combat-heavy challenges tied directly to them means exploration skills matter more here. Once both are collected, a chunk of the region’s collectible content is completed, making this a relatively low-effort way to boost your completion rate.