Golden Back Wolf Skin Gu is a rank three Gu that Fang Yuan refines into the rank four Azure Wolf Skin Gu after two failed attempts.
While cultivating with wolf soul Gu to refine his soul, Fang Yuan refines Gu on the side and, after two failures, successfully refines the rank three Golden Back Wolf Skin Gu into the rank four Azure Wolf Skin Gu. ch. 442
Chronicle
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