Zhang Daoling
The image of two swords on Chinese amulets stems from a legend where Taoist leader Zhang Daoling saw Laozi appear to him on a mountain in present-day Sichuan and gave him two swords. Alternatively, two swords can also represent two dragons from a legend where a man named Lei Huan (雷煥) received two swords and gave one to his son Lei Hua (雷華), who lost it in a river; a servant tasked with retrieving it witnessed two coiled and entwined Chinese dragons.