C440 The Erosion of the Old God
Actually, not to that extent.
The so-called 'Great Old One' sometimes referred to the powerful Divine Sovereigns who had ruled over everything billions of years ago. They were also known as' GreatOldOnes'.
According to the settings, every GreatOldOne at its peak could destroy Earth and human civilization. Later on, the GreatOldOne was defeated by the ElderGods