[Excerpt: The Infinite and the Divine] Trazyn the Infinite Captures and Summons a Genestealer Biophagus
Context: Orikan and Trazyn are descending to the core of the planet Serenade when they encounter Puris the Lamenite and his creations. Trazyn not long after summons them again as one of his five armies against the Deceiver shards within the tomb of Nephreth.
This is when he got them:
“On the fourth day, Orikan’s increasing ennui gained temporary relief when they met a gang of misshapen simian creatures, their alien genestock corrupted far beyond anything he had ever seen. They attacked with massive arms, swinging pieces of construction beam as weapons and goaded on by a shouting experimenter who struck their backs with a rod bristling with syringes. Then, Trazyn drew a labyrinth and the novelty was finished.”
This is when he used them:
“Puris the Lamenite stepped out of the gossamer strands of unreality, his goggle-capped eyes taking in the oncoming rush of metal creatures. His lips curled at their ugliness, fingers drifting to the amulet at his neck, feeling the two wyrms chasing each other in a state of equilibrium. Artless, that is what they were. Sculpted not from the elegant materials of organic matter, but from dead and immutable metal. They did not belong on this planet. This sainted world that would soon be visited by the redeemers from above, arriving in their exquisite skyislands of biomatter. But the sacred swarm could not be called when its prize contained such pollution. He slammed the butt of his injector goad pump on the ragged floor, whistling to call his creations. Colossal forms bounded out of the light, slab-like muscles bunched as they dragged hammers and crude axes shaped from I-beams. They looked at him below ridged brows, tongues too long and sinewy for their short humanoid palates. The eyes, golden, waited for orders. Puris the Lamenite swept his goad towards the foe, and the aberrants tore off at a loping run, thick knuckles speeding them along on the fractured floor. Malformed heads lowered to ram, hooting as they went. ‘Forward!’ he shouted, spiking their bent backs with the goad as they passed, each strike accompanied by the hydraulic hiss of an injection. ‘For the Three-Armed King!’”
I remember being confused by who this guy was on my first read since he was captured unnamed as a small one off and the rest of the armies got such a large amount of screen time. Not to mention a lot was going on when these guys were thrown out. It was never directly stated that he was a Biophagus so it made it more ambiguous. However reading the excerpts together and with repeated references to the coming Tyranids on their bioships and Puris’s injector goad which is specific to genestealer Biophaguses made it more clear.