Illusory Walls
An Illusory Wall is a type of fake wall that will disappear upon hitting it or rolling into it. Some may reveal secret items, shortcuts or at times, even entire areas.
Firelink Shrine
Farron Keep
Catacombs of Carthus
Smouldering Lake
Irithyll of the Boreal Valley
Lothric Castle
Consumed King's Garden
Untended Graves
Grand Archives
Painted World of Ariandel (AoA)
The Dreg Heap (TRC)
The Ringed City (TRC)
Bugs
Illusory Walls are launched outside of the map upon disappearing, and can rarely drag characters closeby with them, clipping them through the floor and potentially killing them instantly.
External Links
Location Guide: All Illusory Walls, Hidden Paths, and Breakable Floors