Ming Yexue (明夜雪: Night's Snow) was once a stone in the Bi'an Beastworld. Millions of years ago Dark Crow visited the Beastworld and took her and two more stones from there. One of them escaped and eventually ended in the Stony Edge Kingdom as Ye Qingcheng, another one ended up in the Alchemy Kingdom and became their second Immortal Emperor, Bi Shi. As for the third stone, Dark Crow brought her with him around the Nine Worlds to strengthen her.
With her talent she became the Prime Descendant of the Alchemy Kingdom. She is very famous throughout the Stone Medicine World, but even so, she keeps a very low profile and rarely goes out in public.