The cultivation method at the Cold Resistance Level is absolutely extremely harsh.
As for the Jade Bone, there's no need to mention it. Xia Hong had already experienced the power of Advanced Cold Beasts in Jing Valley once. It can be said that if it weren't for his perfect Reshaping Skin, having the power of nine manes right when he broke through to the Cold Resistance Level, he probably wouldn't have survived if he were just a slightly more ordinary Cold Resistance Level cultivator.
Jade Bone is the main material, and its high acquisition difficulty can be said to be understandable. The key is that the other dozen herbs in the formula are astonishingly difficult to obtain as well.
Zhu Yinhua, usually found in two places: near a silver mine or in areas where a group of Rodent-like Cold Beasts reside. These Rodent-like Cold Beasts have silver fur and long meat-colored tails, excellent at digging, and extremely fast.
