The Shadowhunter,s codex

congratulations. you are ready to embark upon the righteous and rewarding life of shadowhunter.
we have been chosen by the Angel to keep our world safe from the evil creatures we call "demonds" . and now you are one of us, within this book, you will learn our lore and our ways. Welcome to our ranks,study hard.
this book will be the difference between life and death

based on the books
shadowhunter chronicle by cassandra clare