Jade Bone Gu

It is a bone with smooth, round ends and a long slender middle, with a greenish glow like a green jade stone. ^{ch. 225}

In the Flesh Sac Secret Chamber it appears as a bone with smooth, round ends, a long slender middle, and a greenish jade glow. Fang Yuan refines that copy into his aperture on the spot. ^{ch. 225} He and Bai Ning Bing still hold it among the inheritance haul when they leave. ^{ch. 228}

No cited chapter in this set states a numeric rank for Jade Bone Gu in plain words. Iron Bone Gu comes from the same chamber. ^{ch. 225} Iron Bone Gu is rank three, a label not given to Jade Bone Gu here. ^{ch. 232} Cited chapters also give no Chinese name for this Gu.

Jade Bone Gu remolds the Gu Master’s skeleton into jade-like quality: harder and more supple. The text treats that remodel as permanent, in the same class as Black Boar Gu, White Boar Gu, and Crocodile Strength Gu body changes. It is a one-time expendable Gu. Using it causes extreme pain, and Gu Masters with weak willpower have died from that pain. ^{ch. 225}

It pairs especially well with Ice Muscle Gu. With both, the body is described as ice muscles and jade bones, a combination Bai Ning Bing already half meets through ice muscle alone. ^{ch. 225 ch. 233} That ice-muscle and jade-bone pairing suits Bai Ning Bing, not Fang Yuan. His crocodile-strength plan after Bai Gu mountain rests on Iron Bone Gu, which hardens his skeleton enough to bear the added strength. ^{ch. 233}

Before either bone Gu is used, Fang Yuan and Bai Ning Bing nurture Jade Bone Gu and Iron Bone Gu with spring milk for many days. Bai Ning Bing calls that delay a waste of spring milk. No cited chapter states a feed amount, interval, or food other than that spring-milk nurture line. ^{ch. 232}

Fang Yuan keeps the Gu for a time and feeds it spring milk with Iron Bone Gu before either is used. After he finishes Iron Bone Gu, Bai Ning Bing activates Jade Bone Gu herself. She endures the pain to the end, then faints from dizziness once the remodel completes. ^{ch. 232}

After the remodel, Fang Yuan treats Bai Ning Bing’s ice muscles jade bones as a defense that keeps him from finishing her in one hit. ^{ch. 260} In a later fight, even with that ice muscles jade bones set, she still dodges Tie Dao Ku’s hand-blade strike rather than take it head on. ^{ch. 298}

At San Cha Mountain, the Beast Strength Placenta Gu recipe step “jade bone turned into petals” requires jade bone Gu together with ice muscle Gu and yellow golden relic Gu as refinement materials. ^{ch. 378}