2K and Gearbox Software have unleashed the free “Horrors of Kairos” Seasonal Mini-Event for Borderlands 4, running from October 23 to November 6. Brave Vault Hunters can now face a terrifying blood rain during all world boss encounters — with a chance to score two chilling new legendaries: the “Murmur” Tediore Assault Rifle and the “Skully” Order Grenade.
To celebrate the spooky season, players can also unlock the “Gourd Your Loins” Vault Hunter Head and the “Hex Appeal” Weapon Skin using the SHiFT code:
3S6BB-ZXT93-KRT3W-BT3T3-JW6TZ
Alongside the event, an update brings stability enhancements, multiplayer fixes, improved UI polish, and broad quality-of-life upgrades across visuals, audio, and accessibility. The patch also includes major balance tuning, refined loot systems, and smoother late-game progression—making this the perfect time to dive back into the mayhem.
Enter the blood rain. Conquer the horrors. Claim the loot.
