Dungeon Master's Guide (D&D 4e)

From the back cover:

GREAT HEROES NEED GREAT ADVENTURES

The world has fallen into darkness, but great rewards await those brave adventurers willing to face the terrible dangers ahead. This core rulebook for the Dungeons & Dragons® Roleplaying Game holds everything a Dungeon Master needs to create memorable adventures and grand campaigns to challenge bold adventurers.

The Dungeon Master's Guide® features the 4th Edition game rules and guidelines for creating and running encounters, adventures, and campaigns. It offers a wealth of advice to new and experienced Dungeon Masters, and includes essential game rules for awarding experience, distributing treasure, creating nonplayer characters, and adding mighty artifacts to the game.

Publisher blurb:

The second of three core rulebooks for the 4th Edition Dungeons & Dragons Roleplaying Game.

The Dungeon Master’s Guide gives the Dungeon Master helpful tools to build exciting encounters, adventures, and campaigns for the 4th Edition Dungeons & Dragons Roleplaying Game, as well as advice for running great game sessions, ready-to-use traps and non-player characters, and more. In addition, it presents a fully detailed town that can serve as a starting point for any D&D game.