"Deathwatch Mark of Xenos" by Deathwatch Staff is a role-playing game book published by Asmodee North America, Inc. in 2011. It is 11 inches long, 8.5 inches wide, and 0.2 inches tall, with a weight of 16 ounces. The book contains 144 pages and is written in English. It falls under the genre of games and activities, specifically focusing on role-playing and fantasy. The Deathwatch Staff serves as the author of this immersive game book that transports players to a world of intrigue and adventure.