This is the Four Styles School’s Sect Guarding Treasure.
A divine sword. This sword was three chi long, and white fog hovered around its entire body. From time to time, wind blew; from time to time, thunder and lightning skipped; from time to time, a watery fog churned; from time to time, flames blazed. The four types of Spirit Magic Wind, Thunder, Water, Fire jumped on the sword, unexpectedly oddly mixing together into a whole, making people watching feel disbelief.