The Imiriaran Cycle
The Firstborn disobeyed and denounced God, creating evil. This is known as the Original Sin and it taints all Firstborn males. Because the Firstborn created human life as well, all people in the world suffer at least somewhat under the yoke of Original Sin.
Original Sin is not something that has to be forgiven—human beings were not responsible for the sins of their creator. Instead, it’s a corrupting influence that tempts and sometimes drives humans to impure paths. Original Sin is something that needs to be purged and survived, for it tries to rob men of the free will to choose the path of God.