When does The Eternal Champion return?

The Eternal Champion is the first novel of Michael Moorcock's sprawling Eternal Champion series. In the story, John Daker is pulled through time and space to the tomb of Erekosë, a long-dead hero of a version of Earth that may be the distant past or distant future. Daker realizes he is one of many incarnations of the Eternal Champion, a being who is reborn time and again throughout the multiverse. He joins a great war between humans and an alien race, the Eldren.