The human civilization faced total destruction more than a hundred thousand years ago when the Sea of Dark Matter invaded.
There were only two choices lying in front of the humans at the time.
Given that they could in no way surrender, they had to choose between fleeing and fighting to the end.
Many humans opted to escape the galaxy and went to distant and hazardous places.
They might have either found a new paradise or vanished imperceptibly in the vastness of space.
For some reason, the majority of the humans couldn't leave their home planets. In the end, they had died along with the Sea of Dark Matter under the leadership of that god.
As a god, He had naturally predicted the sad end ahead of time.
And He had also prepared the inheritance for the future human civilization in terms of spiritual and biological aspects.