The Shroud of Silk
An old Shadow of Corwin’s, which surprisingly competent knights. Bears a strong resemblance to Amethyst, though no actual connection between the two has been discovered as of yet.
Avalon was a place that Arthur made his way to in order to gather allies when he was trapped in Oberon’s body. It was important enough to Corwin for him to arrive when Avalon was under assault by Arthur, and for him to personally take care of the problem.