The formation was complete.
Li Ping stood on the island shrouded in white mist, a faint smile of satisfaction in his eyes.
Then he patted the Spirit Beast Bag at his waist and summoned the Desolate Fire Sparrow, the Earth Spirit Mouse, the Scarlet Flood Dragon, and Xuan Er.
His lips moved slightly as he instructed the three spirit beasts to roam freely around the island.
As for Xuan Er, he controlled the corpse and sent it burrowing underground, where the yin qi would help it refine the nether baleful qi within its body.
Li Ping estimated that, in another thirty or forty years, Xuan Er would essentially finish refining the fourth-tier nether baleful qi he had previously infused into its body.
Fourth-tier nether baleful qi was a tremendous tonic for an unholy creature like Xuan Er.
As long as it successfully refined the qi, it would not only reach third-tier top-grade directly, but even strengthen its intrinsic essence to some degree, improving its chances of breaking through to the fourth tier in the future.
Perhaps someday, Li Ping could refine a Silver-Winged Yaksha, just as Ye Xu had in the corpse-refining illusion.
Of course, that was a matter for the distant future. Refined corpses had endless lifespans, but advanced slowly. Who knew what year or month such an advancement would come?
The Desolate Fire Sparrow had only recently reached the third-tier late stage, and its next threshold was fourth-tier transformation.
Thanks to its true spirit bloodline, it was like a human cultivator with a heavenly spiritual root, facing no bottlenecks before the fourth tier. To transform, however, it still had to break through the shackles of its bloodline itself.
That was not something it could accomplish in a short time.
Li Ping did not know whether the Earth Spirit