The age of the Forebears

As the Forebears prospered, Evil spread throughout their dominion. Their Machinist creators knew that this would happen and made the Forebears immune to the aggression that Chaos brings.

This didn't stop the unfaithful from leaving the community and making their own civilization however.
The original Forebears became humans, while the others formed all other humanoid species, such as dwarfs, elves and goliaths.

While many of the Forebear structures remain standing to this day, very little remains of their original civilization.