Hive Fleet Gorgon was a Tyranid Hive Fleet which invaded the Tau Empire in 899.M41. It was relatively small compared to other Hive Fleets, but it was exceptional for its ability to quickly adapt on a biological level to new circumstances of battle. Gorgon in fact manifested more bioform varieties than any other Hive Fleet. This rapid pace of adaptation may have been unique to Gorgon, or it may have been a response to conflict with the Tau, a race who are also highly flexible and adaptable but on a technological level. Gorgon was destroyed in 903.M41 by the combined forces of the Tau and the Imperial Guard.
However, it has since been identified that a splinter of Hive Fleet Gorgon separated from the main Hive Fleet before the final battle presumably to ensure the retention of the bioform and tactical knowledge learned during the conflicts. This splinter fleet headed towards Segmentum Obscurus where it has spent much of it's attentions on the Ferron Sub-sector, in particular focussing on the largest planet Ferron Proxima. Ferron Proxima is mainly a recruitment world for the Dark Angels, it's native people have long been chosen to join the ranks of the First Legion and it's subsequent second founding chapters. The fallen chapters have a strict rota system for choosing worthy aspirants due to the high levels of successful candidates.
Hive Fleet Gorgon's innate ability to change their genetic structure may explain perhaps their specific interest in the planet. Recent samples of captured bio-forms have shown that they are somehow absorbing the Wraithbone liberally spread across the surface. Their chitinous bodies become infused with the Eldar material, making them even more psychically attuned to their synapse creatures. What is even more disturbing is that they do not seem to need to harvest the fragments, just prolonged exposure on the planets surface will slowly mutate their gene code. It's this discovery that troubles the many Bio-magi and Xeno-biologist who flock to Ferron Proxima to study the various unique fauna and flora who inhabit the red planet's barren, desert like environments, rich in iron deposits and basking under sulphur yellow skies.
