User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-4802891-20170402200215/@comment-4802891-20170413163303

The historicity of the vessel is never proven, so she is considered a legend. She was made very famous by a short story published in 1970, but set in a very old era of China.

The divine spirit is an important goddess in China, appearing in quite a few stories. She is almost as important as this "Xi Wangmu" Valeth suggested. There's one simple reason why they are perfect matches.

As bonus hints, Riding A+ is the rank reached by the goddess (which means she can ride phantasmal creatures with ease) and the Noble Phantasm she uses here is a technique that reaches NP level due to mastery and the anecdote attached to it : she cuts the target without touching it, and it makes any females cut by it suddenly more attractive.