The next three days were entirely spent with Yunfeng helping Xu Feng break the seal.
As expected of a Tier 4 Demon King, his methods were extraordinary. Even with the Myriad-Mile Cloud Roc exhausting all his tricks, he only managed to undo half of the seal in the end.
He was powerless against the remaining half, leaving Xu Feng to slowly grind it away himself or find a Nascent Soul cultivator to break it for him.
Chapter 529