Cersihn is the name of a large watchtower in the eastern wall of Fort Sarmenarin. It is mentioned briefly by name in Violet Sword Blade, one of the books of the Untaer Archives, as a place from where guards had spotted a group of soldiers from the Army of Nareikk who had been attacked by Cantharans and were forced to seek refuge in Fort Sarmenarin. They are led by Lokaren and are the first people to mention the Cantharans by name. After this event, Cersihn is not mentioned again in the book.