Blade of Tiamat

You enchant a non-magical bladed weapon. The blade of the weapon becomes covered in dragon-like scales. The color of these scales vary from red, blue, green, white, and black. The blade flickers with flame, crackles with lightning, bubbles with poison, smoulders with ice, and groans with the wails of the damned. The sword deals an extra 2d10 fire, lightning, poison, ice, and acid damage on a hit.