The High were the first beings. They are without end or beginning, they have always existed, and may all the creatures of the world hope that they always will. They are without form, though all races were created in their image.
The High created the world and all the many races in it. After creating the world, some of the dissatisfied High decided to corrupt the world, and thence became known as the Low.
As the centuries passed, the High split into different forms, or perhaps they merely came to be worshiped in different ways and are still united. Either way, the High are now known and worshiped as the Gods.