Disclaimer! Harry Potter does not belong to me. The Sandman does not belong to me.
"D" stands for Many Things
Summary: Harry Potter became an assassin because of his Aunt Petunia. He became a Slytherin because of himself. He became powerful because of The Endless.
Delirium, Desire, Despair, Destruction, Dream, Death, and Destiny are the family of the Endless.
They are not mortal, and their power is certain, as long as there are things to inhabit their realms they will exist.
And like all families, they are slightly dysfunctional. Sometimes the youngest play games with mortals in order to pass the time, but for the most part they stick to themselves.
They are not gods, they are far more terrifying and powerful.
This is how Harry Potter conquered them.
A/N It is not necessary to have read The Sandman to understand this. I explain most of what you need to know, you just have to be patient.