Is there a fortune teller under Mount Tai?

Are grandma Taishan and black mother immortals?

Grandma Taishan and Black Mother are not a fairy.

1, Yuan Jun, Bi Xia: commonly known as Queen Taishan, Grandma Taishan, Mother Taishan, etc. , can "protect all sentient beings, respond to Kyushu with spirit", "take charge of Yuefu magic soldiers and observe the good and evil in the world", and also have the title of sending a son to the empress.

2. Black mother, also called black old lady, is one of the immortals in the fairy belief in Northeast China. This answer is for reference only. Don't be blindly superstitious.