Knights of the Zodiac volume 13 features story and art by Masami Kurumada.

The battle for Sanctuary reaches its climax! Seiya penetrates to the heart of the Master's chamber, only to be paralyzed by the Master's deadly Phantom Demon Emperor Attack. With Seiya stricken, the Bronze Knights seem to have reached the end of their quest to save Princess Sienna's life... but all is not yet lost, as a figure from the past returns to face the Master in a final showdown! The true identity of the Master is revealed and all Knights are tested to their limit in the thrilling conclusion to the Sanctuary saga!

Plus, a bonus story! Alone in Siberia, Hyoga is ambushed by the ruthless Blue Warriors, who demand that he join them or die. Do the Blue Warriors truly possess power equal to that of the Knights? And what plans do they have for the peace-loving Hyoga?