The Mortal Instruments ——-
Runes are what make Shadowhunters different from average humans. They are markings given to the first generation of Shadowhunters by the Angel Raziel to assist them in fighting the Demons they were tasked to eradicate. Every rune known to the Shadowhunters is recorded in the Gray Book. This is a specially crafted book with each rune place in its pages. Copies of the book are rare because each book must be specially made as many of the runes would burn normal paper.