Originally Posted by
apepi
Then they can leave and go somewhere else then? There is a reason they stayed.
They can't just jump off a planet... Only 2 ways they move around: Being initially flung through the Great Dark by the void lords or being summoned by people. Outland very definitely didn't have a world-soul, but had an OG summoned there by arakkoa.
The void lords did not know which worlds contained slumbering titan spirits. Thus they pooled their power and hurled dark creatures throughout the physical universe, hoping some would smash into a world-soul. An unknown number of the void lords' creations hurtled through the Great Dark. They contaminated mortal worlds and everything else they touched in their blind search for a nascent titan. In time, these wicked beings would come to be known as the Old Gods.
--Chronicle V1