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.

Sludgemaw in its Borderlands 4 arena
Sludgemaw is the Big Encore Boss in the September 24 weekly rotation.Gearbox Software / 2K

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.