"Heresy? What are you talking about, Devil Emper—kill him." the Revenants were Wang Ling's perfect clones up till the end of his second life possessing cultivation he did not have before his death, and as such, they have his danger sense, and instincts of a true slaughterer?
His way of thinking, how Wang Ling could survive millions of ambushes and sneak attacks, his astute trust to his senses, the Revenants have that as well as his ingenuity. They all moved to the Devil who prompted his own end, knowing full-well something… was coming.
The Revenants, were all Devil Emperors, they swung their blades, and do not have mental link with one another, but they shared the same instincts. A collective decision, made outside of words but in sheer experience.