Heaven Pool, Ren Sea.
Thunder roared, and lightning blazed.
A figure emerged amid the vast storm of lightning, his imposing frame draped in a purple robe. His deep-purple flood dragon eyes looked down over the entire Ren Sea, and the pressure of his unleashed aura forced the sea's surface down by more than an inch.
He slowly opened his mouth and recited an incantation: "I respectfully invoke the dark luster."
The moon-white mystic pearl slowly rose, spinning ceaselessly. In an instant, it grew dim and indistinct, the image of an obscured moon appearing on its surface before it vanished with Xu Xuan's incantation.
The lightning here vanished along with it. The unleashed might of his divine ability disappeared completely, as though the Sound and Qi that had just intertwined and erupted were only an illusion.
Several breaths later, lightning erupted in a distant stretch of Heaven Pool's waters, raising countless waves. Yet there was no way to trace its Cause and Effect or its passage, as though it had not come from Xu Xuan at all.
"So this is the mystery of Greater Yin..."
The [Returning to Hidden Formless Art] was indeed an orthodox Greater Yin spell, and paired with the [Snow Hall Pearl], it was even more extraordinary. Its mysteries lay in two aspects.
The first was [Returning to Hidden].
The caster could seal away his murderous intent and send it into formlessness, then unleash it at a suitable time and place. Anywhere within the range of his Spirit Sense would suffice.
Viewed in isolation, this Greater Yin art somewhat resembled Long Abode's Mysterious Imprint method. In truth, however, its wonders far surpassed that method-the sealed murderous intent could be released at any time and place, with virtually no restrictions as long as it remained within Spirit Sense range!