Armor of Fafnir: Blood Armor of the Evil Dragon (悪竜の血鎧アーマー・オブ・ファヴニール, Akuryū no ChiyoroiĀmā obu Favunīru?) is an ability that embodies and re-enacts the legend of Siegfried bathing in dragon-blood from Fafnir, granting him a dragon's body with invulnerability that made all weapons ineffective against him during his life. His tall stature, slim body, and darkened skin are all proof of having been soaked in the blood. Having swallowed the blood as well, it circulates throughout his body and affects his organs, later affecting Sieg upon having Saber's heart transplanted into him. Dyed brown with Fafnir's blood and composed of dragon scales, his skin is compared to steel in strength, unable to be wounded by either weapons or magic except with the greatest of attacks. Called invincible in life