Dragon's spell

A sorcerer was assigned to kill a loyalist of the Chinese emperor. The wizard didn't want to kill the loyalist out of mercy and threw a spell to the loyalist to become a Chinese dragon And they became friends in secret without the emperor knowing.
While the wizard saw a big star in the dragon's arms and he wanted to steal the star and the dragon didn't want to. And the wizard broke the star in two.
As revenge, the Dragon threw the epilepsy power at the wizard.