Julien's prophecy about the Dark Man's plans

Julien made this prophecy immediately after his reading in Nira's vardo. He didn't give it in The Dark Man's voice, but it didn't sound like his own voice, either, and his eyes were glowing.
""Through his seed, the captive will become the captor," Julien rasped. "He will break his chains and ascend, leaving his adversary forever bound. The child of three worlds will be the blade that cuts out her heart and flays her soul.
"Would you forge that blade in your body, Aunt Rose? I have so many brothers and sisters, but none are my equal. We could be one big happy family..."
When Rose said that she would never let the Dark Man take Julien, Julien laughed and asked, "You thought that by raising a wolf among lambs, you could teach it to eat grass?" This is the same metaphor that Gianna Russo would use later to describe any attempt to keep the Dukkar from turning to evil.