Core Observer Leads Borderlands 4’s October 15-22 Weekly Rotation
Rising Action carries three modifiers and awards the Symmetry Order Sniper Rifle, while Maurice's Black Market Vending Machine has moved.
Core Observer is Borderlands 4’s Weekly Big Encore Boss for October 15-22, and the Rising Action Wildcard Mission awards the Symmetry Order Sniper Rifle. The rotation went live through a server-side update, with the lineup detailed in Gearbox’s October 15-22 Steam announcement.
Rising Action has the Centripetal, Sulfur Hexafluoride, and Wealthy modifiers. Completing the mission earns Symmetry Order as its Legendary gear reward.
Maurice’s Black Market Vending Machine has moved to a new location, with a visual hint provided for the week. Its location is shared by all players, but the items in each machine vary, so comparing stock with others may help you find a specific piece of gear.
Players need an internet connection to access the current activities. After completing the main campaign, they can find the Weekly Big Encore Boss and Weekly Wildcard Mission in the Map tab of the ECHO menu. This rotation replaces the October 8-15 lineup, which featured Mimicron and the Savage Salvage mission with Aegon’s Dream as its reward.
Which part of this week’s rotation are you most interested in tackling? Follow along for the changing boss, mission, and loot lineup on X, Bluesky, YouTube, Instagram, Steam, and Telegram.
Borderlands 4
Developed by Gearbox Software
See if you have what it takes to go down in history as a legendary Vault Hunter as you search for secret alien treasure, blasting everything in sight.
- Genre Shooter, Role-playing (RPG), Adventure
- Platforms Xbox Series X|S, Nintendo Switch 2, PC (Microsoft Windows), PlayStation 5
- Perspective First person
- Modes Single player, Multiplayer, Co-operative
- Release September 11, 2025
- Publisher 2K
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