The Oath Celestial Q40. Argynvost’s Study: The sole remaining volume lies on the floor behind the overturned chair. Titled The Oath Celestial, the book has been partially burned, and its cover was slashed by a sword. Leafing through the crumbling book reveals that it is a devotional text for knights from a place called the Holy Empire of Valentia. Most of the knights who joined Argynvost against Strahd came from that empire — now lost beyond the mists. I decide to create the book, adopting the Knights Templar's Oath and changing it to fit the with the theme of the Order of the Silver Dragon.