Codex: Witch Hunters is an expansion codex book for Warhammer 40,000 3rd Edition. The book details the planet of Armageddon and the epic battles which swept across it during the Third Armageddon War- one of the largest in the Imperium's history. The codex covers details of the planet and conflict as well as providing army lists for the forces involved. Notably This book also marks the appearance of the Ork Speed Freeks army list.
From the back cover:
Armageddon is a world torn apart by the largest Ork invasion in Imperial history. Inside you will find:
Four Army Lists: Four army list variants allow you to field a force of Ork Speed Freeks, Armageddon Steel Legion Imperial Guard, or Space Marines from the Black Templars and Salamanders Chapters.
Forces of Armageddon: A full-colour guide to the many forces battling for supremacy on Armageddon, as well as numerous examples of the ravaged battlefields being fought over.
The History of Armageddon: Full background and history of Armageddon, including detailed information on the mighty Ork horde of Warlord Ghazghkull and the Imperial forces opposing him.