Why No One Masters Multiple Breathing Styles in Demon Slayer Why doesn't anyone master multiple Breathing Styles in Demon Slayer? The answer reveals the deepest secret of the Hashira. A Breathing Style isn't just a fighting technique—it rewires your entire body, instincts, and mindset. Tengen Uzui literally feels sound. That's the level of commitment required to reach Hashira status. Tanjiro is the only exception, blending Water Breathing and Sun Breathing out of necessity. But even he struggles