Verentor Enupnion gave the secret of the ritual and how to perform it to Nightwing.
The spell required a specific dark region at the depths of the ground. It had to be a place where the light has never shown.
Yet in the massive size of the Midland regions, Nightwing was confident he could find it.
"...And once you do that, the soul of the Half-Fallen Prince will move. His presence is powerful, for he has the strongest legacy of dreams. If you are successful, the wick of the flame will turn black before disappearing. And in that way, the spell, [Dream Caller], has worked. Everyone within twenty kilometers will be affected by this magic. They will fall into the nightmare world of the Dream Caller."
"[Dream Caller]... What interesting magic."
"But it has to be made within places where those elements are present. So it will be up to you to find such places."
"I have a few ideas." Nightwing smiled.