Shi Yang's plan and purpose were simple: to find a powerful force to attack, so that the White Bone faction would overturn the decadent image it had had for a million years and once again become a universally respected Saint faction!
What could be more effective than trampling the Azure Dragon faction under one's feet?
The Four Divine Beasts are recognized as the strongest forces, apart from the Five Great Saints. As long as the Azure Dragon faction is brought low, the White Bone faction will naturally return to being among the strongest of the Five Great Saints!
Moreover, didn't he have a personal vendetta against the Azure Dragon faction?
His beloved junior sister was toyed with by an old dragon, who even left behind a spawn. Just thinking about it made Shi Yang vomit blood!