Wubei Zhi (Vol. 55)

The spear shaft is one foot and five inches long. It may be cast from bronze or forged from iron. It is hollowed out to hold one lead pellet. The spear head is cast in two sections. The top two inches and five 1/100ths of a foot are coated with Tiger Medicine Hu yao a potent poison or incendiary mixture. Two tubes of Poisonous Fire are tied on both sides The fire mixture is processed with refined silver rust, borax, and tung oil. When facing an enemy from a distance, fire the lead pellet to strike them. When the enemy approaches, fire the poisonous fire to burn them. In battle, raise the spearhead to stab them. The lead pellet strikes the enemy causing severe injury, piercing the heart; the poisonous fire burns the enemy until they rot in an instant; the Tiger Medicine causes the enemy to die immediately upon injury. One implement serves three purposes. There is no greater divine efficiency. A single handle of this spear is enough to match three strong soldiers.