He plunged the blade into the dead flesh.
“Tell me again why we are defiling this grave, Roth,” grumbled Watch-Captain Thorne of the Deathwatch. His black-armored form was a statue of disgust, the silver Inquisitorial I on his pauldron reflecting the sickly green sky.
Roth smiled a thin, terrible smile. “The Mark of the Xenos describes the old predators. These are the new ones. Stealth strains. Infiltrators. They carry no pheromone signature. The Deathwatch’s auspexes won’t see them until it’s too late.” Warhammer 40K - Mark Of The Xenos.pdf
The first xenos dissolved into a cloud of acidic mist. The second melted into the mud. The third… was already behind them.
Veridian Secundus, Eastern Fringe
Roth closed his eyes and pressed the data-quill to his own palm, carving the rune of the Mark into his flesh. “Let them see me. Let the Hive Mind know: the Inquisition watches. And we take notes.”
Inquisitor Kaelen Roth of the Ordo Xenos knelt in the mud of a dead world. Before him, spread across the cratered plain like a silver slick, lay the remains of a Tyranid bio-ship. It had been dead for sixty years—a relic of Hive Fleet Kraken—but its spines still towered like cathedral spires, and its chitin still wept a thin, acidic dew. He plunged the blade into the dead flesh
Thorne fired.
“Because the Mark of the Xenos is not just a book, Thorne,” Roth said, not looking up. He ran a gloved hand over a vein of pulsating, iridescent flesh that should have been fossilized. “It is a warning. Every scar the Imperium carves upon an alien breed changes the breed.” Roth smiled a thin, terrible smile
His savant, a pale woman named Helix, held a trembling auspex. “My lord… the bio-signature is wrong. This ship fell in 789.M41. But the cellular decay suggests… three months.”
“No,” Roth said, standing. He pulled a data-quill from his coat and began sketching the creatures as they stood motionless, watching back. “We document. We update the holy text. That is the true war, captain. Not bolter fire. Knowledge . By the time your brothers learn to fight these, the Hive Mind will have spawned three more variants.”