Ryuseken no Tsurugi

Ryuseken No Tsurugi was a divine sword translated to Demon crushing Guardian Sword in English. This Divine Blade was more powerful than any sword

History
Paul Kurosagi (Paul No Tsurugi) have bore the sacred sword used to defeat the demons and the Legendary Fortezza Gundam known as Yamata No Orochi. Okami Yuki was able to seal Orochi in the Blade of Ryuseken for all 1995 years.

In Legend of Zelda
Link bore the Sword and slayed Ganon and the darkness in the land of hyrule. Hyrulians dubbed the Ryuseken into Master Sword.