The Sword of Hiruma is an ancestral blade of the Crab Clan, specifically associated with the Hiruma family. It is recognized for its supernatural purity and is among the ancient clan-forged weapons that hold significant cultural and spiritual importance. The sword was crafted by a shugenja who rendered Hiruma Castle resistant to the First Enemy, making its loss critical to the Hiruma clan's identity. It is one of the few artifacts recovered from the destruction of Hiruma's territory, which was lost to the Shadowlands.
Bayushi Monban revealed that the Sword of Hiruma had been stolen from the Hiruma's new castle, with suspicion falling on the servants of the First Enemy. This theft generated a strong emotional response from Monban, who expressed anger and frustration over the situation. He recognized the significance of the sword to the Hiruma, noting that they had already endured significant losses, and that this theft was another devastating blow to their legacy. Shiba Midori confirmed the sword's magical properties and its status as a point of pride for the Hiruma, emphasizing that its loss was both a spiritual and identity-critical event for the clan.