Ryui Bang/Origin

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Origin
It is an iron rod whose size changes ruyi (as-one-wishes), which Sun Wukong obtains from the undersea palace of Ao Guang, the Dragon King of the East Sea. It is immensely heavy, as it is slightly heavier than 8.5 metric tons. It has the power to change its size, multiply itself, and fight according to the whim of its master. When it is not in use, Sun Wukong shrinks it to the size of a sewing needle and keeps it behind his ear. The novel describes it as being made of "black iron" with two gold bands round it near the ends. In adaptations, it is often depicted as being either red, black, or silver in color, or as a solid gold or copper staff. In some forms of the legend Journey to the West, Ao Guang is shown to have believed that the cudgel was worth nothing until Sun Wukong commanded it to shrink and grow. In others, the dragon king simply believed that it was too heavy to use as a weapon and didn't expect him to take it.

Owner
Ryui Bang's owner is Sun Wukong, also known as the Monkey King. He is the main character in the classical Chinese epic novel Journey to the West written by Wu Cheng'en. In the novel, he is a monkey born from a stone who acquires supernatural powers through Taoist practices. After rebelling against heaven and being imprisoned under a mountain by the Buddha, he later accompanies the monk Xuanzang on a journey to retrieve Buddhist sutras from India. Sun Wukong possesses an immense amount of strength; he is able to lift his 13,500 jīn (8,100 kg or 17,881 lbs) staff with ease. He is also superbly fast, able to travel 108,000 li (54,000 kilometers or 33,554 mi) in one somersault. Sun knows 72 transformations, which allows him to transform into various animals and objects; he has trouble, however, transforming into other people, because he is unable to complete the transformation of his tail. He is a skilled fighter, capable of holding his own against the best generals of heaven. Each of his hairs possesses magical properties, and is capable of transforming either into a clone of the Monkey King himself, or various weapons, animals, and other objects. He also knows spells that can command wind, part water, conjure protective circles against demons, and freeze humans, demons, and gods alike.