Pitch Black and Bone White.
The three different forms of energy flowed alongside each other in a smooth and steady path, transferring all the devil essence from one blade to the other. The Ki acted as the boat and the mana as the navigator as the right-hand blade turned whiter and the left blade became darker.
This continued for some time until a drastic change had come over the two weapons. One looked so dark, it consumed the light around it, while the other was as white as bleached bones. Its slight curvature made it look like the fang of an extraordinarily dangerous beast.
The eye on the hilt of the black blade snapped open and the malevolent aura of a thousand devils filled the air as even more of the devil essence from Cain's body poured into it. Meanwhile, the white blade had the eye on its hit shut, the blade giving off no aura at all.
The White Claw was also a little bit longer than the Black Claw.
***