Sealing Demons is relatively challenging.
Based on the same principle, the whole world has developed many methods for sealing Demons, each with its strengths and weaknesses. However, it's apparent that the difficulty of sealing correlates positively with the strength of the Demons. For a Great Demon like Xing Hui, although she might not have been known for her physical strength, the Jiang Family still took the opportunity to seal her when she was at her weakest at the end of an era.
The Jiang Family is one of the Heavenly Master Families created at great cost by the emperor—or rather, the entire nation. With an extraordinary status, they also had access to resources and a heritage far beyond other Heavenly Masters.
Their Sealing Skill might be the best. Or perhaps... the most advanced?
