Borderlands 4 Makes Plasma Coil This Week’s Wildcard Reward
The Falling Wall rewards the Plasma Coil Maliwan SMG in Borderlands 4’s September 24 rotation. Sludgemaw is the weekly Big Encore Boss.
Borderlands 4’s new Wildcard Mission, The Falling Wall, rewards the Plasma Coil Maliwan SMG. Gearbox’s September 24 weekly notice confirms the rotation is live through a server-side update.
The Falling Wall has three modifiers
The mission uses Cold Hearted, Elemental Eater and Armored. Sludgemaw takes the separate Weekly Big Encore Boss slot.

You need an internet connection to receive the current activities. Once the main campaign is complete, the weekly boss and Wildcard Mission appear on the ECHO menu’s Map tab.
Maurice’s Black Market Vending Machine has also moved. Its location is shared between players, but its stock is not, so another player’s items may differ from yours.
If Plasma Coil is what you need, head for The Falling Wall. The notice does not specify an exact reset hour.