Xirang also known as Swelling Earth, is a magical substance, that had the ability to continuously grow when in contact with water. This made it particularly effective for use by in fighting the rising waters of a great flood that threatened the entire world. According to some accounts the substance was stolen from a half-titan giant who was responsible for the flood. A youthful hero stole as much as his magical black tortoise could carry on its back, and with it, blocked up 233,559 springs, the sources of the flood waters, creating a large mountain range in the process. Some accounts state that the giant was killed when he ate the tortoise carrying the jar of xirang.