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Learn how to locate and open the Blacklime Order Bunker in Borderlands 4 to defeat the Core Observer and farm Legendary drops.
Finding and completing the Blacklime Order Bunker is an important milestone in Borderlands 4. It is the first Order Bunker you come across, and defeating its boss, the Core Observer, at the UVH 2 difficulty is required to meet the conditions for unlocking UVH 3. Although the boss is relatively easy to defeat, entering and navigating the bunker can be challenging because of its bio-armored entrance and multiple passages within.
Borderlands 4: Blacklime Order Bunker Location
The Blacklime Order Bunker is located in The Howl, Fadefields, directly north of The Launchpad faction town. Travel north up the road from the faction town, and you will spot the bunker’s entrance on a rocky hill ahead as the road curves to the right (east).
Blacklime Order Bunker Walkthrough
How To Open the Blacklime Order Bunker
To enter the Blacklime Order Bunker, you’ll need to throw a corrosive canister at its bio-armored door to dissolve it. The machine that dispenses the canister is located on a rock spire directly opposite the bunker’s entrance.
To reach it, use your grappling hook on the grapple point up the rock ridge to the south of the entrance. Then, double jump toward the ridge adjacent to the door, and glide onto the rock spire with the corrosive canister machine. Use the grappling hook to get a canister and throw it on the bio-armored door blocking the bunker’s entrance. Aim high to hit the door directly.
Also Read: Borderlands 4: How To Unlock All Personal Vehicles
How To Reach the Core Observer
Before facing the Core Observer, you’ll have to make your way to the end of the Blacklime Order Bunker to the boss arena. There are no puzzles to block your path to the end, but the numerous passages can turn the bunker into a maze. Killing Order enemies in the bunker is entirely optional, and you can reach the end by running through them.
Head straight through the first room with Synth enemies and turn left into the corridor. Take the opposite exit in the next chamber and turn left in the red-lit corridor. Crouch under the pipes in the next chamber to enter a flooded room. Jump onto the central platform, then double-jump and glide to reach the platform on the right. Interact with the console to open the door.
Swim through the corridor ahead and take the left path. You will reach an area with vending machines. The Core Observer boss arena is through the shaft on the right side. Once you defeat the boss, a Moxxi’s Big Encore station will appear in this area. You can spend cash or Eridium on it to repeat the boss fight.
Also Read: Borderlands 4: Core Observer Boss Guide
Borderlands 4: Blacklime Order Bunker Rewards
By defeating and farming the Core Observer boss within the Blacklime Order Bunker, you can obtain the following Legendary equipment.
| Legendary | Type | Effect |
|---|---|---|
| Bully | Pistol | • Defense Protocol – When Gun Shields are activated, it launches an Attack Drone every 14s |
| Divided Focus | Assault Rifle | • Conquerer – Fires bouncing Projectiles that pierce enemies |
| Defibrillator | Repkit | • Cardiac Shock – When Health goes below 20%, there is a 50% chance to replenish a Repkit Charge |
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