Player's Handbook Races: Dragonborn is a sourcebook for the 4th-edition ruleset of Dungeons & Dragons for the core setting and the world of Nerath. It details the dragonborn race.
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Proud and honorable warriors
If you want to play the ultimate dragonborn hero, this book is for you.
This expansion of the Player's Handbook core rulebook explores the mysteries of the dragonborn. It presents D&D players with exciting new options for their dragonborn characters, including unique racial feats, powers, paragon paths, and epic destinies. This book also includes ways to flesh out your dragonborn character's background and personality.”