The physical book and the PDF scan are designed to look like an in-universe Deathwatch tactical manual. Margins are filled with handwritten Post-Mission notes from various Watch Captains. For example, next to the entry for the Dark Eldar Mandrake, a Black Templar scribbled: "No shadow should breathe. Burn the cell."
This isn’t just a bestiary—it’s a . Inside, you’ll find: 🔍 Detailed xenos threat analyses (from Genestealer broods to terrifying minor races) ⚔️ Special mission rules for hunting alien horrors 🧬 Stratagems and wargear tailored for the Chamber of Vigilance Warhammer 40K - Deathwatch - Mark Of The Xenos.pdf
The title, Mark of the Xenos , is a nod to the Deathwatch’s obsession with cataloging alien weaknesses. In the lore, a Kill-team that destroys a previously unknown alien species is allowed to brand a new "Mark" (a pictographic rune) into the Chapter’s records. The physical book and the PDF scan are
Each entry includes a section on how the creature behaves in combat. Don't ignore this! Tyranids should swarm, Tau should use cover and Overwatch, and Orks should charge fearlessly. If you play the monsters according to their lore, the players will feel the difference in the fiction. Burn the cell
Actionable advice for GMs