The Dragon King wrapped around the sword is said to be an incarnation of Acala.
When Acala competed with a heretic in the power of magic, the heretic transformed into a sword. Acala quickly transformed into a Dragon King and tried to swallow the sword.
The sword wrapped around Kurikara Dragon King is called the Kurikara Sword, and it is said that this sword cuts down the three evils of poverty, anger, and ignorance.