Fiz Gorgo is a large fortress, located in the region of Orist on Meldorin Island, in Ian Irvine's The Three Worlds Cycle. Ian Irvine (born 1950 is an Australian Fantasy /eco- thriller author and marine scientist. The Three Worlds Cycle is a series of novels written by author Ian Irvine. It was possibly constructed by the Aachim and has been home to the great mancer Yggur for hundreds of years. The Aachim are a fictional human species from Ian Irvine 's arc of novels The Three Worlds Cycle. Mancer is a term that describes a practitioner of the Secret Art in Ian Irvine 's Three Worlds Cycle. Yggur is one of the main characters in Ian Irvine 's series of book The Three Worlds Cycle.