Recent Superman villain from the 'Camelot Falls' storyline. I haven't read his story, but apparently quite powerful:
"Khyber is the immortal head of the Hashishim, the elite assassins who threatened the rulers of the ancient Middle East. Soon, he will rise, and begin making alliances with super-villains. Under his guidance, they will rise to destroy the world. The heroes will not know who is responsible until he is too powerful. And when Superman tries to defeat him personally, he will use his advanced technology to throw him at the Earth hard enough to cause a nuclear winter." -A summery of his first appeared from DC wikia.