Futunomitama no Turugi

The Futunomitama no Turugi (フツノミタマの剣) is a stone sword that is owned by the Asakura Family.

About
Futunomitama no Turugi is a red stone sword that has been a treasure of the Asakura Family for many generations. According to Asakura Hao, it was once owned by a sword god and even though it is only made of rock, it is the perfect medium to create a sword-type Over Soul. As a national treasure, the sword would cause an outcry if the world knew it had been secretly stored away by the Asakura Family.

It was used by Asakura Yohken to kill his ancestor Hao when he reincarnated into the Patch Tribe. Five hundred years later, it was used by Asakura Yoh as a secondary medium for his Over Soul during the second round of the Shaman Fight. Yoh's son, Asakura Hana would eventually inherit it and used as the main medium for his Over Soul.

After seeing Hana possesses it, Asakura Yohane proclaims he does not deserve it and decides to take it from him along with his life, but fails and is instead defeated by Hana.

Trivia

 * The kanji for sword, 剣, is usually spelled tsurugi in rōmaji, but in the Kang Zeng Bang Shaman Files, it is transliterated as turugi. The same applies to the futsu which is rendered as futu instead. It is unknown if this is a mistake or intentional.