âEisenhorn: XENOS' is an immersive, fully 3D adventure game, adapted from âXenos', the first book in Games Workshop's best-selling âEisenhorn' trilogy, written by award winning author Dan Abnett. Set in the grim, dark future of Warhammer 40,000 âEisenhorn: XENOS' lets you experience firsthand the story of Gregor Eisenhorn, an Inquisitor...