It is a wearable artifact which belonged to General Tianwei. It is invincible, and the wearer need not fear water nor fire. Even those in proximity to this artifact would find Star Cultivators to be no challenge.
The Golden Thread Armor should also have been buried alongside him since legend says that it was made into a funerary object after his death. Countless Star Cultivators have sought the general’s grave to obtain this artifact, the Golden Thread Armor, but nobody could ever find it.