Do you sense it, Vault Hunter? The darkening crimson skies, the sickly scent of iron in the air, the sloshing of bloody puddles in the mud? It can only mean one thing: Horrors of Kairos, Borderlands 4's first free, limited-time Seasonal Mini-Event, has arrived!

First shown during our PAX Australia post-launch content panel, Horrors of Kairos is free to all players, offering up new rewards and supreme levels of spookiness. From October 23 to November 6, all world boss encounters change the weather to a terror-inducing blood rain, in addition to new Legendary loot you have a chance to get from world boss kill rewards:

• "Murmur" Legendary Tediore Assault Rifle: Executes weakened enemies with guaranteed crits on targets under 35% health
• "Skully" Legendary Order Grenade: This deadly grenade fires projectiles as it seeks out the nearest target

World boss kill rewards are automatically delivered to the Reward Center section of your Inventory screen, under Equipment. Best of luck as you hunt down these bone-chilling, death-dealing keepsakes.

But we've also got two treats you can enjoy right now: the "Gourd Your Loins" Vault Hunter Head usable by Vex, Rafa, Amon, and Harlowe, and the "Hex Appeal" Weapon Skin that can be equipped to any weapon. Redeem the SHiFT code below to snag these goodies*, and check out our SHiFT User Guide if you don't already know how!

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We hope you enjoy soaking in blood during the Horrors of Kairos Seasonal Mini-Event, be it raining down from the sky or spraying from wounds you've inflicted on your enemies. Get out there and hunt down world bosses with ruthless abandon before the event ends on November 6!

*Requires a copy of Borderlands 4, SHiFT Account, and Internet connection. Must redeem by December 31, 2030. One redemption per SHiFT Account. Terms apply.