What to know
- Foundry Freaks are a trio of bosses: Frank the Furnace, Hank the Welder, and Sal the Engineer.
- They can be found in a dedicated arena and are considered a top loot farming spot.
- Expected loot includes a range of legendary weapons, shields, and class mods, but drop rates are quite stingy.
- The area is packed with mobs, so having a strong build is recommended for survival and efficient farming.
After reaching Foundry Freaks in Borderlands 4, you encounter one of the game's most talked-about loot farms. Known for brisk action and a reliable supply of legendary drops, these bosses appeal to vault hunters seeking rapid progression through high-level loot and XP. The foundry setting amplifies the chaos, with machinery and hazards contributing to the intensity.
Location of Foundry Freaks
You can find Foundry Freaks in The Fadefields, specifically in The Pitter Stain Ripper Drill Site. The drill site setting adds to the intensity, with tight areas, industrial hazards, and little room for mistakes. To reach them, progress through Idolator’s Noose until you enter the drill site arena, where the fight begins.
Boss move-sets at Foundry Freaks
| Boss | Key attacks & behaviors | Weaknesses / counters | Suggested strategy |
|---|---|---|---|
| Frank the Furnace | - Uses heavy flamethrower or furnace-based bursts that cover a swath of ground. - Periodic sweeping ground attacks or lava zones. - Possibly summon fire hazards / erupting floor panels. | Elemental damage: fire resistance matters (so prefer non-fire elements like Shock or Cryo) Avoid staying too close when flame attacks are imminent. | Keep distance. Use cover from environmental objects. Time dodges when the floor heats up. Use ranged or area control weapons. |
| Hank the Welder | - Uses welding tools / flamers that shoot steady streams of molten sparks or hot projectiles. - Maybe close-quarters welding arms for melee damage. - Creates zones of heat or weld-fire that linger. | Mobility matters. Elemental effects like Cryo may slow him down or interrupt the welding. Use hits from a distance or from high ground. | Move constantly; avoid staying in one place. Use area-denial tactics. If possible, flank from sides to avoid his forward-facing attacks. |
| Sal the Engineer | - More technical / gadget-based attacks: turrets, welding bots, deployable welding shields or barriers. - May support the others by placing hazards or repairing their armor parts. - Possibly mines or traps in the arena. | Disrupt engineering devices: destroy deployables first. Use splash damage to clear traps or bots. Interrupt repair animations. | Prioritize taking out her gadgets early. Keep pressure so she has less time to build defences. Use grenades / ordinance to clear clusters of traps or bots. |
Expected loot from Foundry Freaks
Here’s a look at the legendary items tied to this encounter:
| Item Name | Type | Manufacturer | Effect Description | Drop Chance Notes |
|---|---|---|---|---|
| Chuck | Shotgun | Jakobs | Fires bouncing pellets that ricochet off surfaces, hitting multiple enemies. | Dedicated drop; ~5-10% chance per run. |
| Bloody Lumberjack | Melee Weapon | Daedalus | Chainsaw-like melee with bleed effects on hits, builds stacks for bonus damage. | Dedicated drop; ideal for close-quarters builds. |
| Chaumurky | Grenade | Order | Persistent explosive that chains to nearby foes, dealing splash damage over time. | Common in pool; great for crowd control. |
| Complex Root | Sniper Rifle | Maliwan | Shots branch into secondary projectiles, increasing accuracy on weak points. | Occasional drop; pairs well with precision classes. |
These are the confirmed drops, but additional randomized loot may appear as with most bosses in Borderlands 4. Farming Foundry Freaks is the best way to secure both of these legendaries.
Defeat Foundry Freaks bosses and maximize loot
Step 1
Reach the Foundry Freaks and use the Moxxi Encore transaction to engage in fight with the three bosses.
Step 2
Enter the arena with a build suited for rapid mob clearance and targeted boss damage, ideally having long-range and AoE options.
Step 3
Focus on mob waves during boss downtime, then burst down boss weak points when exposed.
Step 4
Rotate between bosses to avoid getting pinned, using terrain for cover and movement-based abilities for escape.
Step 5
After defeating all three, immediately check loot drops and extract quickly, as respawn timers are short and more mobs may appear for repeat runs.
Why Foundry Freaks are worth farming
The Foundry Freaks are more than just another tough fight — they’re tied to unique loot that makes the grind worthwhile. Both Chuck and Bloody Lumberjack add valuable options to your loadout, and clearing the Pitter Stain drill site is a satisfying challenge in itself. Whether you’re farming or just exploring The Fadefields, this is a fight you won’t want to skip.
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