There are a multitude of different stories that detail the beginning of this world. Some of them begin with an ageless creature and a will to create. Others begin with a select few particles and a great explosion. Our story begins with both, though not in the way you may have been taught.
Two fragments of a whole, bound to one another from before the Beginning until the End, so intrinsically part of one another that you could not see the division between the two. They existed to exist together, meaningless in isolation. It was said in the stories of old, that these two particles were the first and the power that existed in their magnetism began everything that followed.
An ageless creature of great power feared the raw energy that existed between these two tiny fragments of existence. And as with any fear, it festered and grew until the ageless could tolerate it no further.
They could not be allowed to continue.
The ageless creature split the two halves of the one in a mighty fire that burned for a millennium, the power that was released gave the ageless creature the power to create the world. Everything within it contained, in minute fragments, part of the two that had been divided, for everything existed due to them and their mark could not be removed, no matter how the Ageless tried. When humanity stumbled onto the Earth, fresh faced and eager to learn, this shared agony of the first manifested itself in the soul bond.
For a thousand years the Ageless ignored its creation, resting like a lazy cat on the edge of reality having created a graceful legion of faultless warriors to love and patrol its creation for him. Before too long humanity developed its forebrain, thus culture and music and writing was borne. And with the invention of writing came the mark.
The Ageless did not see for he did not care. One of his finest warriors flew through the air and watched the earth for him, he went by the name of Lucifer. It was then that fate reared its ugly head and seemingly defied the will of the Ageless. Lucifer gazed upon the earth and felt something fresh, something new. He sought out the new thing, curious in a way no warrior of the Ageless ought to be.
A small babe's cry pierced the dawn of the new day and life was irrevocably changed. From the moment the babe was separated bodily from its mother the warrior felt a sharp blinding pain and his soul was marked with her name. He gazed, incorporeally, upon the tiny child and wondered at what he saw. On the child's wrist in the ancient language of the warrior race was the word 'Lucifer.' And he loved her.