The White Dynasty Wall is a placeable block that is used in the background. It does not block monsters from walking into your home or the player.
Along with a Light Source, it is used to prevent Monsters from spawning. Like all Walls, it can only be broken with a hammer or a hamaxe. It can also be destroyed by using explosives. This is also a criteria for housing.
Like all walls, 4 of these walls revert it back to its previous state, Dynasty Wood.