Stop double-posting. It's annoying.
The young man spun quickly, his black-armoured arm lashing downawards, tearing the sword thrown at him into two. He looked slightly surprised to see the weak little man on his feet again.
"Now you're starting to piss me off..."
With that, he was behind Rio. A surge of energy flowed down his arm, and he pressed it to the young man's back. Rio stopped moving, as the energy coarsing through 33-666's arm interfered with the nerve impulses along Rio's spinal cord.
"You will soon learn, boy, that your foolish creatures here...are nothing compared to the true powers of this world!"
The world around the two was suddenly blacked out: Umbra swirled up around them, encasing them. If Rio could not die while Darkness existed, then 33-666 would simply cut him off from the Darkness. Umbra was not truly darkness, it was more a combination of darkness with several other substances and energies. With it encasing them as it were, no true darkness could penetrate through to them.
A scream was heard: 33-666, letting his triumph known, and, when the Umbra-Bubble subsided, a pool of blood gushed forth, and a ragged cloak fell to the ground, all that was left of Rio. Without the presence of darkness, his invunerability negated, it had been a simple matter for the flesh-clone to disintergrate him.