The first world where Starlight and Darkchild appeared. When the two beings appeared humanity was barely entering the age of the internet, as the world was embroiled into a world war as Stark Knights fought each other with devastating amount of power.
With the escalating conflict, Starlight loyalists took over the governments of the world and began a war of extermination of any remnant of Darkchild's influence. In the span of two decades they were able to form a new world order, as their new found veneration for Starlight became the official world religion.
Since then they've dispatched agents to other timelines or worlds where the two cosmic entities would battle for influence, as Starlight kept spreading her children across the multiverse.