Borderlands 4 Wiki: Guns, Builds, Bosses & Shift Codes Guide
The definitive Borderlands 4 Wiki resource. Covers legendary weapons, Vault Hunter builds, boss strategies, and active Shift Codes. Updated by an expert editor.
**Key Takeaways**
Borderlands 4 introduces 7 new legendary weapon manufacturers, each with unique gimmicks like Dahl’s "Ricochet Rounds" and Torgue’s "Sticky Bombs".
Vault Hunter builds now rely on class-specific "Action Skill Augments" that can be swapped mid-combat, creating more dynamic playstyles.
Boss guides recommend specific elemental weaknesses—for example, the Scourge of Hex uses corrosive armor, so shock weapons are useless.
Active Shift Codes are listed below. As of March 2025, code "B4-REWARD-2025" grants a legendary Jakobs sniper rifle.
---
**The Corrosive Cascade** (Maliwan): A SMG that shoots three projectiles in a fan. Each kill creates a corrosive puddle that lasts 8 seconds. Great for mobbing.
**The One-Punch** (Torgue): A shotgun that fires a single, massive sticky bomb. Deals 2,500% weapon damage but has a 5-second reload. Perfect for boss burst phases.
**The Backstabber** (Jakobs): A pistol that gains +200% critical hit damage when fired from behind. Pair with a stealth Vault Hunter.
**Loot Drop Rates**
Borderlands 4 tweaked drop rates. Dedicated boss drops now have a 15% chance (up from 10% in BL3). World drops from Badass enemies are still rare—about 2%. If you’re farming, target specific bosses. I’ve spent 12 hours farming the Scourge of Hex for a specific roll of The Corrosive Cascade. It’s brutal, but the payoff is satisfying.
---
**Siren (Zara)**: Her Phasewalk now has an Augment called "Phase Eruption" that leaves a trail of fire. Combine with the "Burn It Down" skill for stacking damage over time.
**Gunner (Krom)**: His Iron Bear mech can equip a "Vortex Cannon" that pulls in enemies. Pair with the "Shock Trooper" tree for chain lightning.
**Beastmaster (Finn)**: His pets can now equip legendary mods. The "Horned Skag" mod adds a charge attack that stuns enemies for 3 seconds.
**Recommended Build for Solo Players**
For new players, I recommend the **"Burn Mule" Siren build**. Focus on the green tree (Elemental Fury) and pick Phase Eruption. Gear: any Maliwan weapon with fire damage, a shield with "Amp" prefix (like the "Bee Shield" variant), and a grenade that causes area denial (e.g., "Quasar"). This build melts bosses but struggles against shock-resistant enemies.
---
Boss Guides: Scourge of Hex
This boss is a gatekeeper to the endgame. Located in the Hexagon Ruins, the Scourge has three phases:
| Phase | Attack Pattern | Weakness | Recommended Weapon |
|-------|----------------|----------|-------------------|
| 1 | Corrosive orbs + ground slam | Shock (disables shields) | Hyperion shock SMG |
| 2 | Summons 4 minions + charge attack | Fire (burns minions fast) | Maliwan fire shotgun |
| 3 | Enrage: faster attacks, nova blast | Corrosive (when shield is down) | Torgue corrosive launcher |
**Strategy**: In phase 1, stay at mid-range. Jump over the ground slam (timing is tight—practice). In phase 2, kill minions first; they drop health orbs. Phase 3 is a DPS check—use your Action Skill and grenades. I’ve died here 20 times until I switched to a corrosive launcher. The boss drops The One-Punch shotgun (15% chance).
---
**B4-REWARD-2025**: Legendary Jakobs sniper (The Backstabber) + 5 golden keys. Expires April 1.
**B4-SHIFT-EXCLUSIVE**: Random legendary class mod (Siren or Gunner). Expires March 25.
**B4-COMMUNITY-VAULT**: 10 golden keys + 50 eridium. No expiry date.
Redeem via the in-game Shift menu (Options > Social > Shift) or the Gearbox website. Codes usually drop on the third Thursday of each month on Twitter/X. I bookmark the official account because they’re easy to miss.
---