The staff first appears in the third chapter when the Monkey King goes to the underwater kingdom of Ao Guang, the Dragon King of the East Sea, looking for a magic weapon to match his strength and skill.

This quarterstaff can change its size as a swift action, from tiny to gargantuan. As a standard action or as part of a charge you can make a special attack by suddenly increasing the size of the weapon at the same time. You attack all opponents in a column which length equal to the reach a quarterstaff of that size would have and width equal to 1.5m + 1.5m per two size categories above medium. You have to be able to wield a staff of that size. Perform one melee attack roll and do melee damage normally.