Knights of the Zodiac (Saint Seiya), Vol. 9 — Masami Kurumada

Who is the Master of Sanctuary? As the Bronze Knights enter the 12 palaces of the legendary Gold Knights, they're attacked by forces against which mere armor is powerless. The Master wields uncanny power over space, time, and dimensions, and the wrong step can send a hapless Knight spiraling into infinity...But the far ends of space and time are nothing compared to what the Knights must face to penetrate to the heart of Sanctuary. One by one, figures from the past return to haunt them. Hyôga is forced to battle a beloved former teacher. Shiryû descends into the land of the dead, where only prayers can save him. And Seiya learns, to his horror, that one of his most powerful friends has been transformed into a deadly enemy!