Beneath Original Sin

[No suitable genre tag could be found for this book. It might be called modern fantasy.]

He was hauled from the sea and forged in fire. By the time he returned to his body, he no longer bore his original name.

Amber sealed away the first glimmer of flame. Lodestone began to draw in silent dust. A prism refracted white light into a thousand colors. Then he pushed open the furnace door and saw what lay in the depths of the fire.

His soul was forged into an iron ingot and fused with a certain rule.

After that, if he still had the strength, he would become the Creator himself.