William looked at the 40-odd figurines of various sizes around him. After two days and one night of experimentation, he came to a preliminary conclusion.
First of all, it had to be a Kane figurine that had been blessed by the Eighth Order before it could be used as a medium to extend his strength.
Among the more than 40 different figurines collected, only the Great Sage figurine of the Kane Church, the silver figurine on Nizemar's pendant, and a small number of figurines that had also cracked from the divinity manifestation met this requirement. The other figurines made by civilians weren't capable of completing such feats.
Even if he tried casting a figurine with the same material afterward, he still couldn't use it as a medium.
According to Nizemar, the way these figurines were blessed had always been an internal secret of the Eighth Order's Sealing Temple. Even she—as a relic hunter—had no right to know the exact method.