The ageing machine minds of the Longsight facility have been coaxed into life by the Research Clerics of the Shield Crusade. Slowly they have yielded raw data, long range telemetry and motion tracking schemes. When analysed, this information has revealed a tyranid swarm, a splinter fleet, but powerful enough to wreak havoc through the Eastern Scatter and across the Nor Sub-sector. The splinter has been code named
Hydra. Initially
, Hydra seemed unfocused, the swarm moving in great, inconstant swirls in the empty region beyond AA-572. However, prolonged processing revealed a general 'drift direction' in the swarm,
Hydra heading slowly in the direction of BB-993. On the strength of this intellegance, Detached Command Grettoris has deployed a full strike force to this system, identified as the most likely target for the next tyranid advance.