[As William Butler Yeats] saw the gray and grimy streets of Dublin give birth to a "terrible beauty," so Alan Garner shows that the complacent lives in a Manchester suburb can be intertwined with a "terrible beauty" [in Elidor]. With deceptive simplicity, Garner tells of the battle for the good—the light—in the world called Elidor and how that battle can hinge on the tenacious belief of a Manchester child named Roland. (p. 328)

Alan Garner is celebrated for his use of mythology, which he calls "spiritual gelignite" and "distilled and violent truth," phrases which may be analogous to Yeats's "terrible beauty." Garner takes the background for Elidor from several sources. The name Elidor, the four cities of Findias, Falias, Murias and Gorias, and the four symbols of power are taken directly from the Tuatha de Danaan stories in Celtic mythology. The maimed king and Helen's cup echo...