The final Galerian that Rion meets in the game, Cain looks almost identical to Rion. His name is most likely a reference to the biblical figure, as his aim is to kill his "brother". Cain then tells them that "mother" had chosen Rion over him to find Lillia, since all of Rion's past memories where implanted in his brain. Rion refuses to believe that it is true and the two brothers fight in rivalry.
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"You were born to find Lilia. And I was born to kill you. We live only to serve mother. We must...