Sandstone Walls naturally-generating background walls found in the Underground Desert. Underground Deserts generate by default the normal Sandstone Wall which may be converted into Ebon-, Crim-, and Pearlsandstone Wall if exposed to the Corruption, Crimson, and Hallow, respectively. Converted Sandstone Walls may further spread conversion. See biome spread for more information. These walls can be destroyed with a hammer, but will drop nothing. These walls also do not stop enemies from spawning and cannot be used for proper housing.