First there was the novella of The Eternal Champion, this was expanded to novel length as The Eternal Champion. This was duly followed by a sequel Phoenix in Obsidian also known as The Silver Warriors.
During the early 1970s the Erekosë series included a third and fourth books as part of Interconnected Series.
A third book was added in the late 1970s, the graphic novel The Swords of Heaven, The Flowers of Hell.
The official third of the trilogy was added in 1986, The Dragon in the Sword.
Erekosë also appears in The Quest for Tanelorn and The Sailor on the Seas of Fate fighting Agak and Gagak, The Vanishing Tower and The King of the Swords with Corum and Elric to defeat Voilodion Ghagnasdiak and The White Wolf's Son.