Great Fiend-level monsters were practically impossible to kill.
The cultivators' most glorious achievement before this had been Mountain Mover Great Sage striking Lord Elephant head-on, grievously wounding it and forcing it into a deep sleep.
No. A few days ago, that achievement had already been surpassed when Zhong Shenxiu severely wounded the Giant Sea Monster of the North Sea with a single sword strike and sealed it away.
Yet no one had expected that, today, a Great Fiend-level monster would actually fall on Chongming Island!
"Yellow Dragon Great Sage had almost completely transformed into the Dao at the final moment of his life, raising his cultivation to the Great Sage realm's limit. After all, he came from a heterodox path, but his Daoist Arts were formidable... As for Three-Headed Saint Venerable... no, Three-Headed Saint Venerable had only just become a Great Fiend-level monster. Perhaps... some sliver of rationality remained in him, and he sought his own destruction during the battle?"
Great Sage Li Xuan made a guess.
"A Great Fiend cannot die. In truth, a Great Sage cannot die either..."
Zhong Shenxiu sighed. "Even if they die... if they've fused with some concept, and no one occupies that concept afterward... perhaps, after ten million years, they might strangely be reborn..."
This was also why the Lord of the Door had to erase Corpse Release Immortals from their very origins when exterminating them.
If ordinary methods were used, then even after killing a Corpse Release Immortal, one might still leave them a chance to revive.
Put simply, the corpses of Yellow Dragon Great Sage and Three-Headed Saint Venerable might strangely come back to life one day in the future.
But the Crown Prince of Inner Demons, whom Zhong Shenxiu had killed, could absolutely never revive.
However, his methods had been gentler