Beth warns you that the reboot has disturbed a notorious local beast: the Omega Thresher. She transmits coordinates to an arena-like area north of Borderlands 4 Boosting your location. Grapple into the enclosure and prepare for a boss fight.

The Omega Thresher isn't colossal, but its bio-armor makes it tricky. Luckily, you've already mastered the locust gas strategy. In the arena's back corner sits a gas dispenser. Grab canisters and lob them at the Thresher to strip away its armor, leaving it vulnerable to gunfire. Repeat the process while dodging its heavy attacks until it finally goes down.

After the fight, your Vault Hunter notices a vomit pile nearby. Shoot it, and out crawls none other than Colonel Oatmeal, Beth's long-lost pet Creep. It's a slimy but heartwarming reunion.

Returning to Beth

With the Omega Thresher defeated and her beloved companion recovered, head back to Beth at Lakeside Properties. She thanks you for your efforts and formally completes the mission.

For your trouble, you'll earn:

XP and Cash

A chest in your inventory containing a weapon (randomized as Uncommon or Epic)

Mission Summary

Here's a quick breakdown of everything you need to do in One Slimy Issue:

Talk to Beth at Lakeside Properties after finishing One Gassy Issue.

Break into her lab using locust gas canisters and reboot the system by activating both switches.

Repair the first monitor device: Defeat THE SCRAPVENGER, recover the missing part, and reinstall it while fending off threshers.

Repair the second monitor device: Retrieve the spare part from the crane platform, fight Creeps, clear overgrowth, and restore the system.

Battle the Omega Thresher in its arena using gas canisters to break its armor.

Discover Colonel Oatmeal, then return to Beth for rewards.

Why This Mission Matters

While One Slimy Issue offers the usual Borderlands rewards of XP, cash, and Borderlands 4 Gear, the mission also develops Beth's role in the story. Her resilience against the Order grows stronger with every quest, and reuniting her with Colonel Oatmeal adds emotional weight to her arc. Plus, the Omega Thresher encounter is one of the more memorable mid-game battles, combining puzzle-like mechanics with the series' trademark chaos.

By completing this quest, you not only help Beth strengthen her surveillance operation but also unlock a weapon reward that could prove valuable for the challenges ahead. It's a slimy situation worth diving into.

Crystal Brawl is the twelfth main mission in Borderlands 4 if you choose to pursue Vile Lictor's questline after defeating Idolator Sol and Callis. The Auger relic hints at your next step with the message, "find the Siren." This walkthrough will guide you through every stage of the mission-from your first encounter with Creeps in Bolten's Bore to Borderlands 4 Boost the climactic battle against the refinery machine.