Thoughts raced through Wang Yu's mind, and a spark of excitement kindled within him.
For either the Yin Soul Banner or the White Bone Fiend Banner to advance, one method was to slowly nourish it with vast quantities of pure Yin Energy. Relying on this method alone, however, would take so much time and Yin Energy that even a Foundation Establishment cultivator of the Demonic Path could exhaust a lifetime's efforts without ever seeing success.
The other method was to first advance the bonded Ghost Creature within the banner, then use that higher-tier Ghost Creature to drive the Magical Artifact's advancement. With enough Ghost Creatures to devour, either the Yin Soul Banner or the White Bone Fiend Banner could advance rapidly, with an extremely high ceiling.
But whether this method would still work on Blue Star, a world without even Yin Energy, was something Wang Yu himself could not say for certain.
"Forget it. I'll confirm the matter of the living soul iron first," Wang Yu finally murmured. Forming a hand seal with one hand, he flicked several spell seals at the black rod with a finger. They faintly formed the phantom outline of a white Spirit Inscription pattern, which flashed once before sinking into the rod.
The ink-black rod immediately turned silvery white again. He had temporarily sealed it with a spell to prevent its aura from leaking out and stirring up the Yin Spirit within the Bone Banner again.
Then he touched a finger between his brows. A sweep of silver light surged out, and both the living soul iron in his hand and the Bone Banner before him vanished in a flash.
Wang Yu went to the bedroom to get some sleep.
Since something had happened at the Slaughterhouse that night, it would only be natural for