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Borderlands 4 October 23 Patch Notes | Horrors Of Kairos Event, Legendary Weapon Buffs & Major Bug Fixes

Posted: Oct 24, 2025 Views: 414

Posted: Oct 24, 2025

Source:  IGGM

Views: 414

Hello Vault Hunters! The week-long delayed Borderlands 4 patch is finally here. This patch is packed with content, including bug fixes and the Horrors of Kairos event.

So, what does the October 23rd patch bring to Vault Hunters? What Legendary weapons have been buffed? Horrors of Kairos introduces two new Legendary weapons - how can you obtain them? Let's take a look.

Borderlands 4 October 23 Patch Notes | Horrors Of Kairos Event, Legendary Weapon Buffs & Major Bug Fixes

Vault Hunter Balance Adjustments

Harlowe The Gravitar

First, fixed a bug that caused a significant frame rate drop, and Pencils Down class mod no longer rolls +6, now +5. Gun damage buff of Harlowe now applies to Ripper Heavy Weapon and Entanglement. Neutron Capture's damage type has been changed from gun damage to radiation damage, which is a significant nerf.

Amon The Forgeknight

Amon has received several bug fixes this time, including issues with the cooldown of Onslaught in multiplayer and the frequency of Rocket Punch. Shield visual effects have also been adjusted to improve clarity in combat.

This update focuses on Amon's abilities, which have generally received buffs:

  • Each stack now lasts 4 seconds, and all stacks are lost if a kill is not achieved within that time.
  • Blackout: Fixed a bug where it could only invest 1 point, now it can invest 5 points. However, the damage per point has been reduced from 21% to 15%, but overall it's still a buff.

Vex The Siren

Before the patch, Bleed Vex was the simplest, yet most disruptive, build. This patch fixes a bug that caused Bleed effects to recursively stack, causing infinite damage. As expected, this build's damage will be significantly reduced, but she can still use abilities like Witchy Trigger Finger and Torgue Stickies work together to deal high damage.

To complement this, the damage and duration of Double Trouble Icon and Apex Beast in Here Comes Trouble (Red Tree) have been increased, but this buff won't significantly change the build, since its core issues lie in AI and tracking speed.

Rafa The Exo-Soldier

The free grenades dropped by Rafa's Legendary COM now deal the correct amount of damage. APOPHIS Lance skill's penalty has been changed from affecting Gun Handling to affecting Gun Accuracy, no longer affecting Projectile Speed, and now benefits from Cooldown Reduction.

In addition to the above changes, Class Mods have received comprehensive buffs, particularly those related to melee damage and melee shields. Notably, Groundbreaker now only stores damage from guns, action skills, and heavy weapons, and no longer stores damage over time, which fixes a recursive damage loop that could cause infinite stacking damage.

Gear Adjustments

Borderlands 4's guns have received a number of adjustments. Improving gun handling skills now actually increases projectile speed, and several bugs that could trigger infinite ammo have been fixed. Notably, assault rifles have received a comprehensive buff:

  • Star Helix: Fire rate +33%.
  • Bonnie and Clyde: Base damage +40%.
  • Pair of Thieves: Bonus damage increased from +100% to +150%.
  • Bugbear: Base damage +40%; Special ability damage +100% to +200%.
  • Rowan's Charge: Fire rate +100% and slightly reduced recoil.
  • Lucian's Flank: Lucian's Flank now has +50% base damage and reduced recoil.
  • Aegon's Dream: Base damage +35%.
  • Jakobs Crit Knife: Critical hit chance reduced to 30%.

Horrors Of Kairos

  • Date: October 23rd - November 6th.
  • New Equipment: Murmur Legendary Tediore Assault Rifle and Skully Legendary Order Grenade
  • Horrors of Kairos SHIFT Redemption Code: 3S6BB-ZXT93-KRT3W-BT3T3-JW6TZ

These two new weapons can be obtained as loot from World Bosses on Kairos. Since this event is limited-time, we recommend participating in Horrors of Kairos event first to obtain these weapons.

General Improvements And Bug Fixes

Progression, Loot, And Rewards

  • Eridium Reduced: Specialization requirement reduced from 5000 to 1500.
  • Boss Drops: Added loot for certain bosses that previously did not drop loot.
  • Collectibles: Fixed a bug where not all ECHO logs could be collected. The associated cosmetics will now be unlocked. (Cosmetic).
  • Gear Handling: Improved handling of gear that unlocks rewards while driving.
  • Lost Loot Machine: Now prioritizes higher rarity items.
  • Cash Drops: Loot Enemies now drop more Borderlands 4 money.
  • Golden Chest: Fixed a bug where it could not be opened even with a key.
  • Achievements & Soft Locks: Fixed issues with some achievements not unlocking and some minor soft locks.

Gameplay & Missions

  • Black Market Vendor: Now functions properly in multiplayer.
  • Legendary Vending Machine: No longer unexpectedly closes during Vend of the Line mission.

Weekly Activities

  • Big Encore Machine: Moved to Ripper Drill location in Battle Wagon, allowing you to farm special weapons like Bugbear and Finnity XXX-L.
  • This week's Wild Card changes: Rewards the legendary weapon Kickballer (repeatable).
  • Black Market Vendor: Relocated and new items added, making each player's inventory unique.

This Borderlands 4 patch is a massive balance overhaul and bug fix. The focus is on nerfing overpowered skill combos and weapon interactions, while also buffing underperforming weapons and skills, and fixing numerous bugs that impacted gameplay. While some top builds have been nerfed, these improvements, along with numerous bug fixes, may allow some previously underperforming builds to enter the new meta.

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