Dungeon Brick Walls

Dungeon Brick Walls are the background Walls found naturally-placed in Dungeons. There are 9 different varieties, chosen at random during world generation. A single Dungeon may contain several different types in different areas. The Faction Flags present in a given Dungeon area will correspond to the Dungeon Brick Wall variant found there.

Dungeon Brick Walls cannot be crafted, but can be obtained with a Hammer or Dynamite. Like naturally-placed Dirt Walls, Dungeon Brick Walls can only be mined from one of their edges (meaning that the wall tiles to be mined must be adjacent to empty tiles). As with all walls, Dungeon Brick Walls collected and placed by players will prevent enemy spawns, and most can be used for valid NPC Housing; the only exception being the Blue Slab variant (see below), which will not produce a valid House.

Variants
The type of Dungeon Brick Wall present in an area of the Dungeon, as well as the Faction Flags found there, will indicate which types of Hardmode Dungeon enemies will spawn after defeating Plantera. Walls or Faction Flags collected and placed by players will not cause enemies to spawn.

Trivia

 * The banners in each type of floor tell you what kind of fighter and caster enemies there are in that area.

History
Mur en Brique du Donjon 던전 벽돌 벽지