Ghost Soldiers(阴兵):
In Chinese, it is pronounced as: yīn bīng，Written as:

Ghost Soldiers are a mythical force in Chinese folklore, typically believed to be composed of deceased soldiers or spirits. In folk culture and Taoist beliefs, Ghost Soldiers are described as a supernatural phenomenon with immense power and mysterious abilities.
The legend of Ghost Soldiers originated in ancient China, with many stories involving soldiers who perished on the battlefield whose souls could not find peace, thus forming an invisible army. Legend has it that Ghost Soldiers often appear in ancient battlefields, graveyards, or places with a heavy gloomy energy.
Ghost Soldiers are usually depicted wearing ancient military uniforms, armed with weapons, marching in neat rows, and making faint sounds of drums and bugles. In some tales, Ghost Soldiers are invisible, but their marching can be heard during the night or through the fog.
In Taoism and some folk beliefs, Ghost Soldiers are seen as the army of the underworld, responsible for maintaining order, capturing malevolent spirits, or carrying out tasks in the netherworld. Sometimes, Ghost Soldiers are believed to be summonable to protect a place or assist someone in warding off evil spirits and omens.
The legend of Ghost Soldiers has been portrayed in Chinese folktales, dramas, and films, becoming a common element in stories of mystery and the supernatural. In some local folk festivals or ceremonies, performances mimicking the march of Ghost Soldiers are held to pray for peace and ward off evil. Some scholars believe that the legend of Ghost Soldiers might represent a collective memory and psychological projection of ancient warfare trauma. Modern people often view Ghost Soldiers as a cultural phenomenon, reflecting curiosity about the unknown and reverence for death.
As a mysterious and legendary presence, Ghost Soldiers embody various interpretations of life and death concepts and supernatural culture. The significance attributed to them in different historical periods and regions enriches Chinese folk culture.