The Time before time

This books how Azazael became Azazel and how Ana met him. 

https://www.inkshares.com/books/the-time-before-time--b1cf7d

All the books in the series are telling different parts of a character's life. 

Azazel, the former king of hell.

Azazel, the former king of hell. Many believe he created most of the monsters we fear such as Cthulhu, Vampires, Werewolves and even dragons.