Shinobi

Shinobi, also known as "Shadow Art", is the art and spellcraft created by Soshi, the alter ego of Shosuro during her lucid days and after her mysterious disappearance. The art of Shinobi has been absorbed by the Shosuro family and used it to dceive their opponents, creating doubles and illusions.

from, "Way of the Scorpion", pg. 21