Another part of my article...

Crusnik: A species of genetically enhanced creatures created pre-Armageddon to survive the harsh climate of Mars, the Crusnik are vampires who need the blood of other vampires - or at least the bacillus contained within it - to sustain them. Fortunately, Abel (see second pic) and Seth do not use their Crusnik forms very often, and never at 100%, so they don't need to go out massacring Methuselah every day. Cain (see frist pic) is another story. Crusnik can live at least 1000 years and by all indications, much longer. It's been 900 years since Cain and Abel had their literal "falling out," and neither of them - nor Seth - show any signs of slowing down.