The Dungeons Master Source Book

Most Pen and Paper have a GM (game Master handbook) with in this its information about the world. And the dungeon master may not control all the NPC but they control the world around them, and some of the PC. With only Dice rolls to stop them

If they say a DRAGON attacks, or rolling 1 magic spell gives you giant Breast, or you have to Roll a 20 to resist a your charms...then it happens

But what if it was a book that give you power for REAL. Where your the author of the world

Well there is such a book.
But where who gets it?