The Borderlands 4 Whack-A-Thresher mission feels like a nod to Tremors (1990), the cult-classic monster thriller about giant underground worms. With the storyline set on Kairos, however, this quest fits perfectly into the planet’s lore rather than being just a pop culture reference.
While the mission might sound intimidating, it’s actually one of the easiest side activities in Borderlands 4, taking less than five minutes to finish if you know the right steps. Here’s a complete walkthrough of how to unlock and complete Whack-A-Thresher, along with all the rewards you’ll earn.
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How to Unlock the Whack-A-Thresher Mission
Before you can play Whack-A-Thresher, you’ll need to:
- Travel to The Howl, located in the Fadefields region.
- Find Mort, who will give you this quest.
- Complete the “Breeding Daises” side mission first — Whack-A-Thresher won’t appear until that prerequisite is done.
Once that’s complete, talk to Mort to begin your thresher-whacking adventure.
Also Check: Borderlands 4 Money Guide: Best Tips to Farm Cash Fast on Kairos
Step-by-Step Walkthrough
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Talk to Mort in The Howl – He’ll explain his thresher problem.
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Whack the Threshers – These giant worm-like creatures can’t be killed with bullets. Instead, you must use ground slams when they poke their heads out of the ground.
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Use Grapple Points – Since timing your jumps can be tricky, look for nearby grapple points to gain airtime and slam down with precision.
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Repeat until complete – Slam the marked holes enough times to damage the Threshers.
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Return to Mort – Once you’ve dealt with them, head back to Mort to finish the quest.
Pro tip: Don’t waste ammo—ground slams are the only way to hit them, so focus on positioning and timing.
Rewards for Completing Whack-A-Thresher
After wrapping up the Borderlands 4 Whack-A-Thresher mission, you’ll receive:
- XP (experience points)
- Eridium x2
- Cash (1000)
The rewards aren’t massive, but the mission is quick and low-risk, making it an easy way to farm XP and Eridium without much effort. If you’re looking for a tougher challenge afterward, try liberating the Order Silo in the Fadefields for better loot.
The Borderlands 4 Whack-A-Thresher side mission is short, simple, and a fun nod to pop culture worm monsters. With a straightforward objective and low difficulty, it’s the perfect quest to complete between bigger story missions. Plus, it offers some quick XP, Eridium, and cash with almost no risk.
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