Naica is a city in the northern state of Chihuahua, located in the Municipality of Saucillo and dedicated to mining since the 18th century. Apart from its prominent lead production and its famous Selenita Crystals Caves, it is known because it is a damn city full of witches who spend it doing damage to the suffering mortals. If people do not take proper precautions and collect them at home before 10:30 p.m., it is quite possible that they will repent for life, if at all. The witches, those bad stones, leave the abandoned mines in the form of flying fireballs, to take the children away.
The reason for this legend is for children to obey their parents