A coverless book with no title on the outside, personally penned by the Sect Master of the Joyful Union Sect. It is the sole surviving copy in existence. The background illustration features two people in an intricate embrace with lifelike anatomical details. Sang Nian's brother gave it to her, presumably to use Xie Chenzhou as a cultivation vessel. Xie Chenzhou mistakenly believed Sang Nian wanted him as her yang-draining cultivation vessel because of this book.
