3D Model: A Single Futuristic Katana With A Very Long, Thin Blade Made Entirely Of Glowing White Light. The Blade Is At Least 1.5x Longer Than A Normal Katana, Resembling An Odachi In Length But Extremely Slender And Sleek — Not Bulky. The Blade Is Pure Energy, Glowing Bright White With Faint Trailing Effects, As If Made Of Plasma Or Divine Light. Do NOT Generate More Than One Sword — Only One Weapon Should Appear. The Handle Is Black, Tightly Wrapped With Textured Grip Or Futuristic Leather, With Tiny Silver Or Red Details. The Guard (tsuba) Is Minimalist, Possibly Floating Or Glowing, Matching The Sci-fi Aesthetic. The Design Should Feel Like A Celestial Or Cyber-samurai Weapon, Elegant, Sharp, And Intimidating. Only One Sword. No Duplicates.