|Please note: This article is about the ancestral sword of the Matsu. For other uses of the term, please see Blade of Fury (disambiguation).|
|First used by:||Matsu Gohiro|
|Currently in the possession of:||Unknown|
The Blade of Fury was the ancestral sword of the Matsu family.
Kyouranken was a tachi-style sword created by a master sword smith for Matsu Gohiro, grandson of Matsu. After the death of Gohiro and his wife Matsu Shiomi, who was wielding the blade in her last moments, the sword passed to his eldest son. 
The soul of Gohiro's wife had passed onto the blade, and she could communicate with the wielder. The user immediately entered a powerful battle fury until the he could no longer see any enemies. The fury allowed him to enhance his martial abilities and greater endurance against wounds, but after the effect passed, the toll of the injuries taken might worsen. Many of those who wielded the blade died, and it was believed that their fighting spirits also added their power to the potency of this weapon. 
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