Nyx and Scion

From publisher blurb: Nurture vs. Nature Fiendish twins, raised apart, one becomes an agent for their father, Lord Orkus, and seeks out magic and devices that can be used to bring Orkus to Earth. The other, when not fighting the forces of evil, functions as the official expert of the supernatural and occult for CASTLE. Super Powered Legends. Because sometimes you a need a character everyone knows, even if they're meeting them for the first time.