This subject contains information from the "Lovecraft Circle" Myth Cycles, and while guided by HPL are not based on his work alone.

So T'yog wrote his protective formula on a scroll of pthagon membrane (according to von Junzt, the inner skin of the extinct yakith-lizard) and enclosed it in a carven cylinder of lagh metal—the metal brought by the Elder Ones from Yuggoth, and found in no mine of earth. This charm, carried in his robe, would make him proof against the menace of Ghatanothoa—it would even restore the Dark God’s petrified victims if that monstrous entity should ever emerge and begin its devastation.
~ H.P. Lovecraft & Hazel Heald , "Out Of the Aeons"

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