Goddess of Carnage

More than fifty years ago, heaven acquired a great triumph the day the demon king was finally defeated and killed. His "pets", dangerous beasts of carnage, fell into eternal slumber. The demon realm was completely sealed off, making its inhabitants unable to leave at all. Heaven's greatest nightmare was gone, so everything should be well, right? Wrong. Not when the cultivation world had begun to see reasons to believe that the dead demon king might not be so dead after all.