"Yes, precisely the Moon Brick. With this treasure, I can rapidly refine soldiers."
Song Lin was not deceiving anyone.
Back when the Xuanke Temple still didn't have the Temple Emperor Seal, they used corpse bones to refine Rampant Soldiers, and the Moon Brick served as a major material. The speed of refining soldiers was several times faster than before.
The Moon Brick was made of the Seven Treasures—such as Golden Ying, Tridacna, Agate—and combined with the secret techniques of the Moon Cultivating Clan.
It contained an immensely rich amount of Moonlight Power, which was far superior for cultivation by ghosts and other beings than absorbing ordinary Sun and Moon Essence.
Some Taoist Temples without resources for Qi Refinement even purchased them to refine qi, obtaining Seventh-rank Yin Moon True Qi.