During Vaan's previous stay in the Holy Knight Empire, he had sent out an ultimatum to everyone in a position of power or status within the defeated country – they were required to surrender their personal aura cultivation methods to show their loyalty and support for their new ruler.
Those who failed to comply would be seen as holding contempt for the new monarchy and considered rebels.
Of course, Vaan had also informed them of the fate that awaited such rebels – to be burned in the radiances of his semi-divine flames.
It was an overbearing demand that could easily raise discontent and spell the doom of its tyrant ruler. Even so, the threat was very effective in producing the desired results.
More than five hundred scrolls had piled on Vaan's desk.
Throughout history, tyrant rulers have always met untimely ends. As such, overbearing demands couldn't be made of the country often – it would shake its stability with uncontrollable unrest.