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Warhammer 40,000: Deathwatch, Mark of the Xenos | Cubicle 7 Games

But it isn’t just a stat block repository. It captures the flavor of the setting: the Deathwatch’s obsession with analyzing and neutralizing threats. The book treats the Xenos not just as monsters, but as "Target Analysis" subjects.

No other single volume provides as much detail on how the Deathwatch thinks . The in-universe commentary in the PDF is frequently cited on wikis and by lore YouTubers. It is the definitive source for “How to kill a Hive Tyrant” tactics.

Who should read/play it

The remains the definitive guide to the alien monstrosities lurking in the void between stars. It represents a golden era of 40K RPGs—a time when the focus was on investigation, tactics, and the creeping dread that even a Space Marine can be outmatched by a strange biology.

The book isn't strictly about aliens. It also touches upon the Forbidden Xenos , artifacts, and how the Deathwatch interacts with other Imperial factions regarding the containment of these threats. This is excellent fodder for roleplaying hooks—what happens when a Kill-team wants to keep a Xenos artifact for study, but the Inquisition demands its destruction?

| Chapter & Page Count | Key Foes & Focus | | :--- | :--- | | | Detailed profiles for the Tau Empire (e.g., XV8 Crisis Battlesuit , Vespid Stingwings ), the Tyranid Hive Fleet Dagon (e.g., Carnifex , Lictor , Zoanthrope ), Ork forces (e.g., Warboss , Killa Kan ), and minor xenos species ( Lacrymole , Loxatl Mercenaries ). Also includes a selection of Kroot forms. | | 2. Radicals and Heretics (~22 pages) | Profiles for various renegade humans and their monstrous creations. Key examples include the Apostate Cardinal , the daemonic Irradial Cogitator , and the HereTek Magos Phayzarus , a magos who literally consumes Space Marine organs to gain their power. | | 3. The Forces of Chaos (~32 pages) | A bestiary of daemons and Chaos Space Marines. This chapter covers lesser and greater daemons of all four Ruinous Powers ( Bloodletters , Plaguebearers , etc.), corrupted Space Marines, and terrifying war machines like the Obliterator . | | 4. Advanced Adversaries (~12 pages) | Provides new, advanced rules for the GM. The centerpiece is the system for battling Hordes (massive formations of weaker enemies), along with new Horde Traits and optional rules for large-scale warfare to challenge a squad of Space Marines. | Warhammer 40K - Deathwatch - Mark Of The Xenos.pdf

: Features detailed profiles for iconic enemies including the ravening Tyranids , the technologically advanced T'au , and brutal Ork hordes.

For Game Masters (GMs), this PDF is a toolbox:

Because Fantasy Flight Games lost the license to produce Warhammer 40K RPGs to Cubicle 7 (and later to Games Workshop itself), the PDF is no longer for sale on official platforms like DriveThruRPG. This has turned the file into an abandoned, yet highly sought-after, legacy document. Warhammer 40,000: Deathwatch, Mark of the Xenos |

"The line between man and xenos is thin indeed. It is our duty to ensure it remains so."

Mark of the Xenos is a comprehensive bestiary and sourcebook for the Fantasy Flight Games Deathwatch tabletop RPG, focusing on alien threats within the Warhammer 40,000 universe. It provides detailed rules, lore, and statistics for major Xenos factions like Tyranids, Tau, Eldar, and Orks, alongside advanced mechanics for Hordes and Xenos weaponry. Share public link