The entire altar acted as a giant seal, and the nine spell-covered chains on top of it were spirit tools that had the ability to maintain the restriction on whatever was inside. However, the power of the chains’ spells had slowly lessened with time; even specially-made Black Iron chains would still be weathered by Demonic Qi and the forces of nature, causing its restrictive powers to wane.
The Qing-Yun disciples’ tasks were to repair the worn-out spell locations on the chains so the spells would return to their original strength, and to examine the formation within the altar to check for any damage. Once these tasks were completed and confirmed, the beast king within would no longer have any chance of escape, although even now the odds of it escaping were marginal at best; after three hundred or so years of being sealed, even something as powerful as a Golden Core Stage beast king could be made weaker than even an ordinary beast.
