Earth-666

Earth-666 was one of the many universes in the Original Multiverse. It was destroyed during the Crisis and later recreated in the New Multiverse.

Creation
Earth-666 was created when God and Goddess fell in love and had sex for the first time. This event would later be known as the Big Bang.

Humanity
God then began working on a new project that he called humanity and this angered Goddess so much that she created plagues and floods in an attempt to get him to give up on this project. This led to God casting her out of Heaven and down to Hell where she would stay for thousands of years until she finally escaped while Lucifer was on Earth.

The Crisis
During the Crisis, John Constantine visited Earth-666 with John Diggle and Mia Smoak and found Lucifer Morningstar at his club. John then asked for a way to travel to Purgatory to restore Oliver Queen's soul and Lucifer gave him a card that made this possible. Earth-666 was later vaporized by Antimatter.

Residents
See here.