Winston C. (Crabby-doctor) reviewed The Swords Trilogy: The Knight of the Swords / The Queen of the Swords / The King of the Swords on + 296 more book reviews
There are at least two subsequent versions of this book with the same three books included: "The King of Swords","The Queen of Swords", and "The Knight of Swords." Thjis one is from August 1977, so is "vintage."

The dark things are coming. Even the gods feel fear. In the conjunction of the Million Spheres, all things are possible. The mystic Vadhagh are destroyed - all but one. Prince Jhaelen pursues his fate and seeks vengeance through the 15 planes of the earth.