Davis's Talent
The Soul Palace had two of these assessment stones but never shared them with anyone as apparently, this kind of assessment stone could find all three talent sources.
The Spirit Root, Spirit Blood, and Spirit Essence, the three of them pointing to Essence Gathering Cultivation, Body Tempering Cultivation, and Soul Forging Cultivation, respectively.
It seemed that Isabella and Shirley also had one each, but it was fixed on an altar in the Immortal Grade Treasury, so there was no apparent way to take it outside.
He had thought that it wouldn't work on feys as it didn't work for Nadia, a magical beast. Fortunately, this assessment stone worked on Evelynn, who became a fey. Even though she had a magical beast, this told him that she was still human, making her a half, a fey.