The oldest of the Test Tube Babies, Cain is often seen as Seth's elder twin. He was once the gentle, beloved leader of the Mars Colonization Project, until an accident killed him. Seth injected him with hyper-arenal Crusnik nanonmachines which saved his life, but also drove him insane. In the war following the return of the colonialists to Earth, he and Abel took the side of the vampire returners. When Cain’s lover’s influence made Seth question their choice, Cain killed her. Furious, Abel, and Lilith confronted their brother, pushing Cain out of the space ship and into the atmosphere. His body burned into a pile of ash. Cain was able to regenerate his body from the ash, however.
Nine hundred years later, he met Isaak Fernand von Kämpfer. Together, they took over the Rosenkreuz Orden, a small, insignificant organization in Berlin that consisted of enemies of the Vatican. Through Cain and Isaak's charisma and power, the Orden grew into the world's leading terrorist organization. Cain's motivations are unclear, but he seems bent on the destroying humanity and the world though he is one of its very saviors. His subjects refer to him as "Mein Herr" which is German for "My Lord." He is also referred to as "Mein Herr Contra Mundi", German for "My Lord Against the World". His most popular title, however, appears to be Contra Mundi.
Once his brother Abel learns Cain is alive, Abel's primary goal becomes to kill Cain once and for all. When Cain leads the Rosenkreuz Orden on an attack of Albion, the two brothers have their first clash and Cain kills Abel with relative ease due to his higher Crusnik fusion level and Esther's sudden appearance that distracted Abel. Realizing Abel had destroyed the control panels of the rocket, he plans to merge himself with Abel's body to get the access codes from Abel's memory. However, Abel is revived with Elizabeth's nanomachines thanks to Catherina and Tress. This puts Abel at the same power level as Cain and their next clash ends in a draw. Accompanied by Ion Fortuna, Abel has pledged to hunt Cain for eternity, if need be, until he is destroyed.
When his Crusnik powers are activated, Cain's eyes turn Silver, his hands grow blue claws, he grows four Skeletal wings, and a black sword materializes in his hands. He appers as a spitting image of the storybook grim reaper at 100% except for his Crusnik tattoos his clothing and The cross on his for head….his sword also transforms. In this state, he can generate destructive red energy. When not in Crusnik form, he appears to have the power to launch a destructive and invisible force from his hands and to possess super strength. Among the four Crusniks, Cain is the only one who has fused 100% with his nanomachines, He soon journeys with Seth after a conflict with the order causes him to loose his memory of his life as a crusnik. He later was captured and forced among the ranks of the reapers, but after a decade he was rescued by Seth, and because of his alliance with the Orden, he remains moderately safe from the Reapers' grasps. Because Seth never knew the full extent of Cain's form, the history that he was able to give him lead Cain to only understand the basis of his crusnik existence and a maximum of 15% crusnik activation.
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