There were several ways to find the Child of the World: the Watchers Guild's intelligence network, the wealthy merchant Luck Celebration, the intelligence network of the Rhine Kingdom, and the intelligence network of the Duchy of Nier.
The Duchy of Nier was notoriously overbearing, but its attitude toward the Watchers Guild had always been quite good. The duchy revered martial prowess and had a favorable impression of hunters.
Apart from these channels, Su Xiao had one final method: relying on the Contractors to search. There were probably several hundred Contractors in this world. Though their numbers were small compared to the other parties, Contractors had sharper powers of observation.
The only problem was that after finding the Child of the World, the Contractors would most likely kill him and drop a Treasure Chest. In a native world, the backlash from killing the Child of the World was slight. As long as one did not kill the "Chosen One," it was fine. The two were not the same concept.
However, having the Contractors search for the Child of the World carried a risk. Some Contractors might already have joined the Ancient God faction.
The Ancient Gods were dangerous, that was true, but the Ancient God in question had only recently revived and was very willing to make use of any combat power that came to pledge allegiance. If it had been one of the Three Ancient Gods from the Wizarding World, those who pledged themselves to it would most likely become test subjects, dying during some sacrifice or fear extraction.
Su Xiao had discovered long ago that the Ancient Gods seemed to be very fond of the emotion of fear. The fear of others could most likely bring them some kind of benefit. After all, among all emotions, fear was the