Ghost Solider

Yin soldiers are souls who died unjustly, like dying in battle without being buried properly. Witches and wizards will go to graveyards or past battlefields to collect those kinds of souls into their troops. Yin soldiers are very dangerous, they can betray their masters at any time. The betrayed masters will likely to have their necks twisted and die instantly. The Yin soldiers basically divided into three types: the Minions, the Marshals (or the Mandarins), and the Emperors - the strongest type of them all. Emperors are the strongest and rarest, they are the evil spirits of kings whose tombs have been destroyed, deposed, whose bodies have been covered up so they have to wander. The Emperors have the power to move mountains and fill up seas, no one in the world of wizardry has been able to conquer. Next, the Mandarins/Marshals - the pinnacle of minion training. They are the souls of generals who died in battle, but their spiritual energy still remained at the field. Their power, although much inferior to the Emperors, is also powerful. In the past, they were the ones who worked for the kings, but got sentenced to extreme punishments. Rumor has it that whoever obtains one of these two kinds of soldiers will have tens of thousands of soldiers followed in a glimpse of an eye, but they have to put their lives on the line to achieve it.