The Overworld is a "laran" representation of the real world. A person with "laran", especially when using a matrix, can travel at great speeds in the Overworld and communicate as if face-to-face with others who are there. In "The Spell Sword", Damon Ridenow searches for Callista Leynier, who is missing, in the Overworld, and encounters a part of the Overworld that is blocked off by a powerful "laran" presence. It seems likely that Callista is within the inaccessible area. In "Exile's Song" Marguerida Alton destroys the representation of Comyn Tower in the Overworld that Ashara has maintained for hundreds of years to stay alive. Later she learns that she has destroyed the real Comyn Tower, part of Comyn Castle, as well.