Discover the locations of all Carcadia Burn Vault Key Fragments in Borderlands 4, so that you can access one of the Primordial Vaults.

To access one of the Primordial Vaults in Carcadia Burn in Borderlands 4, you need to collect its three Vault Key Fragments. Once inside the Arch of Radix vault, you will face the Primordial Guardian Radix boss. He has dedicated legendary weapon and class mod drops that will significantly help you with the intense combat in the gameplay.
Here is a detailed article that contains everything you need to know about the locations of all Carcadia Burn Vault Key Fragments in the game.
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Location of All Carcadia Burn Vault Key Fragments in Borderlands 4

As mentioned earlier, you need three Vault Key Fragments to access the Vault. All of them can be found within the Carcadia Burn region. Once you collect them, you can head inside the Vault to begin the process of collecting the special items. Below are the detailed locations to collect all three Vault Key Fragments in Carcadia Burn.
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Lopside Vault Key Fragment

The first Key Fragment is easiest to collect among all three. To collect it, arrive near the Makeshift Chalet Safehouse. Afterward, look for a one-pumper gas station. Now, use the grapple to reach its top. Once there, you will find the first fragment on the top of the dining table.
Tonnage Peel Vault Key Fragment

To find the second Key Fragment, arrive at the Wreck of the Last Great Hope point of interest. Next, enter the wrecked structure and locate a metal grate on the floor. Now, use your grapple to pull it open, drop down into the tunnel, and follow the path to the right to find the second Vault Key Fragment.
Ruined Sumplands Vault Key Fragment

To obtain the third and final Vault Key Fragment, all you need to do is arrive near the lake, close to Hull’s Handbasket point of interest. Once you arrive at the area, head down the slope and keep an eye on the right side of the path. After a short distance, you will find the final Key Fragment sitting openly near a rocky structure close to the lake.
These are all the locations of Carcadia Burn Vault Key Fragments in Carcadia Burn in Borderlands 4. Once you collect all three, you can enter the Primordial Vault and face its challenges.

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