Heavenly Secret Gu

It resembles a dragonfly, but on closer inspection it is more like a twig. The whole Immortal Gu is very long, about half an adult arm. Its body is thin and long like a twig, and very soft. On each side it has seven feathered wings that are thin and green, resembling leaves. ^{ch. 1475}

Fang Yuan recalls that within wisdom path there is an Immortal Gu that lets a Gu Immortal obtain answers directly without colliding thoughts or making deductions, as long as they grab onto that strand of heavenly secret: Heavenly Secret Gu. Historical record names it as created by Paradise Earth Immortal Venerable, who possessed a rank eight heavenly secret Immortal Gu that disappeared without news after his death. Fang Yuan treats that Gu as able to question heaven and earth, and as a threat that could expose his secrets if used against him. ^{ch. 657}

Old Man Yan Shi later uses Heavenly Secret Gu and spends a hundred years of lifespan to deduce that Spring Autumn Cicada is in bad condition and has already been used. ^{ch. 1017} Sixth Hair carries the refinement to its final step, then Fang Yuan takes over the refinement path immortal formation and drives the killer move Heavenly Light Ring through seven rotations until the ring shrinks to a speck and a rank seven heavenly secret Gu lands on his head. It is his second attempt after the first refinement failed, and the success surprises him; he guesses it may be down to his luck path methods and very good luck. ^{ch. 1475} Paradise Earth Immortal Venerable created the Immortal Gu, Spectral Soul Demon Venerable’s split soul Old Man Yan Shi refined it, and it was destroyed in the battle of Yi Tian mountain. ^{ch. 1476} The finished Immortal Gu flies so slowly that it seems to float. ^{ch. 1475} Old Man Yan Shi had created heaven’s will dissipation, a wisdom path killer move with heavenly secret Immortal Gu as its core that can get rid of heaven’s will completely, but left it incomplete. Fang Yuan completes it several days later and starts using it on Spring Autumn Cicada. ^{ch. 1476}

Sixth Hair says the second round of Gu refinement is complete. Fang Yuan refined Spring Autumn Cicada and Heavenly Secret in that round, after Cleanse Soul, Self Love and Snack in the first. ^{ch. 1481}

Heavenly secret Immortal Gu is the core of the immortal killer move heaven’s will dissipation, which can eliminate heaven’s will. Fang Yuan had already used it against Spring Autumn Cicada before using it on a dream realm for the first time. ^{ch. 1490}

Fang Yuan lists rank eight Heavenly Secret Gu among his own heaven path accumulation. ^{ch. 2227} He states that Heavenly Secret is in essence a heaven path Gu worm, though he had once thought it was wisdom path, and that Paradise Earth Immortal Venerable created it with heaven path attainment already in hand. Activation can peek into heaven’s will and answer from heaven and earth, and out of ten activations at least eight fail and cost ten to seventy years of lifespan on failure, tied to heaven path materials and dao marks rather than a mystery of the Gu alone. ^{ch. 2275} Fang Yuan refines rank nine heavenly secret Gu and then modifies the killer move obscured heavenly secret. ^{ch. 2283}