Although the Kojiki describes nothing about what Amatsura, a blacksmith, had done, Norinaga MOTOORI (classical scholar of the Edo period; his aim was to discern the identity of Japanese culture through an intensive study of the ancient classics, especially the Kojiki) assumed that Amatsura might have had a hoko (a long-handled Chinese spear) made.
鍛冶師のアマツマラについては何をしたかが書かれていないが、本居宣長は矛を作らせるためではないかと推測している。