Essence Iron Bone Gu

Three days after delivering ancient bronze skin Gu, Li Xian brings essence iron bone Gu to Fang Yuan on San Cha Mountain. ^{ch. 355}

Appearance

It is like a black bone. Its two ends are round and smooth, and its body is thin. While floating in the air it emits black rays of light. ^{ch. 355}

Form and rank

The Gu looks like a black bone with round, smooth ends and a thin body. It emits black rays of light while floating in the air. It is a rank four Gu, and Iron Bone Gu can be obtained by reverse-refining it. ^{ch. 355}

Effect

When activated, black light passes through skin and flesh and changes the skeleton. Fang Yuan’s bones are already pitch black and iron-firm from Iron Bone Gu; under this Gu they grow firmer still. The hardening is many times stronger than Iron Bone Gu, and the process needs much more time. ^{ch. 355}

Fang Yuan uses it continually beside ancient bronze skin Gu while tempering his body. Over a month after leaving King Quan Inheritance he is almost finished with ancient bronze skin Gu, but still far from completely mastering essence iron bone Gu. ^{ch. 355}

During that tempering, when he activates Bone Wings Gu, his skeleton already surpasses ordinary from Iron Bone Gu and his recent rank four essence iron bone use, so the grown wings are pitch black with a metallic steel luster and far sturdier than ordinary bone wings. ^{ch. 358}

Defense set

He later finishes using essence iron bones Gu and raises the toughness of his bones to about twice or thrice of before. Ancient bronze skin, essence iron bones, and golden steel tendon Gu mold into one defense. Combined with golden shield Gu, that defense is treated as enough to handle the full strength of a rank four peak stage Gu Master. ^{ch. 368}

Soft bones pressure

Body modification removal

Beast phantoms removed