Gladius Dux

The Gladius Dux (支配者の剣, Shihaisha no Ken), known as the "Sword of the Commander", is a key item exclusive to Bladestorm: Nightmare. Once owned by a forgotten race, this ancient artifact has the power to control the minds of monsters and slay supernatural beings.

Joan of Arc discovers the sword at Nantes and hands it to the protagonist before being taken captive. Its effects on the monsters are initially feared by the English and French armies, though the relic is later viewed as their only means of salvation against the demonic horde especially after they gain control over dragons. After the mastermind Diabolus is fully destroyed, Joan tosses the sword into the ocean so that no one can abuse its powers ever again.