Of all the groups, secret societies and allegiances created in the Babylon 5 setting, the most memorable and influential is arguably the Anla'shok. The Rangers are an intriguing organisation best defined not as what they are but as what they are not. The Rangers are the guardians at the gate, the shadows against the shadows. They are not warriors on any battlefield but the hidden ones of back alleys on distant worlds and the corrupt corridors of traitorous powers. This sourcebook both removes some of the mystery from the Anla'shok and adds several new layers of 'grey area' for Games Masters to use in their campaigns. It greatly expands the character options for Rangers, both in the hands of Players and as characters they encounter during the course of a campaign. The full history of the Anla'shok, from their founding a millenium ago to the changes brought about by the formation of the Interstellar Alliance, along with guidelines for professional behaviour, how to proceed during missions and what procedures a well-trained Ranger should take when dealing with unknown lifeforms, interfering government officials and even the most dangerous of combat situations. The various tools and weapons available to the Rangers for use in the field, from the ubiquitous denn'bok to the multiple forms of the White Star combat vessel at their command, including a walkthrough of a standard White Star cruiser from aft docking bay to its front weapons array. Details of important sites of the Anla'shok; Tuzanor, City of Sorrows, the ruined planet of Kaddora and the mysterious Anla'shok caches that Rangers find in the most unlikely of places. This book is also filled with information about how to play Rangers as characters, including new prestige classes, the Ranger as a full character class and new feats and options for members of the Anla'shok to take during play. Gamemastering tips are given on how to incorporate the Anla'shok into existing games or create a new campaign centred on an Anla'shok group. Book jacket.