Sin

In an alternate Multiverse was born a terrifying creature formed entirely out of hate. This creature became known as the First Evil, a monster who threatened to obliterate the still fledgeling Multiverse.

Forging a great weapon known as the Staff of Light, a member of a Dark Tribe known as Genesis took on the First Evil single-handedly, locking him in a dimensional prison, but not before the First Evil managed to plant the seeds of doubt in Genesis' heart.

Sometime later, blinded by rage over a mass slaughter of his fellow kin, Genesis mercilessly returned the favor to the Tribe of Light, killing everyone, even his lover; it was then that the First Evil was able to find his way out of his dimensional prison, guided by Genesis' hate. Genesis fell under the Evil's power, becoming it's vessel, and forming Eclipse.

Eclipse would be responsible for numerous other atrocities across several Multiverses, until he was defeated and devoured by Nova, thus turning her into the new "First Evil".