Cyneah's assumption was correct.
The Four Greatest Minds of the Ancient Clan indeed used samples of real Ancient Magic Cores during the initial phase of their research. Shaiha did not know whose Ancient Magic Cores they were, but they were definitely from prominent figures, and the one who supplied them was the Higher Being.
Yet, even the Higher Being had its limits. It could only assist in procuring samples that were within his reach. Alas, there was no Void Core sample to be found.
But that was unimportant at the moment. From what Cyneah was saying, she believed that the sample of the Draconic Core might contain an essence. When the Four Greatest Minds succeeded in their research, the artificial Draconic Core inherited it.