The essence of a Light Attribute Crystal Core was simply something containing a high concentration of Light Attribute energy.
Something like that would most likely exist only within a true Ruins of the God of Light. Places that merely had some connection to the God of Light did not meet that requirement.
From the seven locations with abnormal energy fluctuations, Duke made another round of selections and ultimately chose three places most likely to be Ruins of the God of Light.
He planned to investigate those three places one by one and see whether he could find anything.
The first place Duke chose was Ice Wind Valley in the north, where an ancient complex of buildings buried beneath ice and snow had been discovered, preserved remarkably well.
There were clear symbols of the Light Church at the entrance, and the architectural style somewhat resembled the existing Temple of Light, only far older and more mysterious.
The entrance was extremely well hidden, and ordinary people would never have found it. The team Robert had sent out had only discovered it by accident after using some real-world surveying knowledge.
After thinking for a moment, Duke said, "I'll investigate Ice Wind Valley in the north first. Have your people wait for me there. I'll set out shortly."
"Lord Duke, let me go with you," Robert volunteered.
Duke shook his head. "No need. Your team can serve as guides. Stay in Sky City and continue handling the other matters."
Although he was not bringing Robert along, Duke had someone else he wanted to take with him: Saintess Daili.
As an important figure in the Light Church, Saintess Daili should be able to play a crucial role in the ruins of the God of Light.
Of course, it still depended on whether Daili had the