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The «Dragon Bone Axe (竜骨の斧, Ryūkotsu no ono^?)» is a tool that is carved out of an ancient dragon's bone - the highest grade material for weapons available in Underworld - and the hardness of the axe is only surpassed by Divine Instrument class weapons. The villagers of Rulid Village 300 years before the events of Prologue I ordered this axe from  the capital to use for cutting down the «Gigas Cedar», as the blades of normal axes would break and be no longer usable after the first hit on the tree. The axe has a toughness that surpasses iron, allowing it to be used in chopping the equally tough tree.