A Genestealer is a species of Tyranid used as the ultimate shock trooper. Their purpose is to advance ahead of a Hive Fleet and pinpoint potential planets for the Tyranids to devour. They are amongst the most deadly creatures in the Galaxy, combining high cunning, lightning-fast reactions and movement, with large, diamond hard, extremely sharp claws that can rip through the toughest armour in seconds.

20 of them along with 10 of their hybrid children were set into a frenzy as the Hive Fleet approched, They spread throughout the city killing anything they can reach. 8 Genestealers swarmed at the 6 creatures that had just exited the APC. 

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The Hive Fleet was close now, the planet although impeccably Tiny at this range was in sight.

The shadow in the warp would now begin taking effect.
FTL engines stall in any attempt to escape the system and long range calls for help receive nothing but static in return.