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Hive Fleet Leviathan

Hive fleet Leviathan was a two pronged attack approaching from below the galactic plane, spreading the phenomenon known as the Shadow in the Warp, which resulted in loss of communication across many Imperial worlds (however, it should be noted that communications between worlds already between the pincer of Leviathan were unaffected).

The fleet appeared as a pair of closing jaws, cutting off huge stretches of space from warp travel and astropathy. Leviathan carved through the Imperium, devouring worlds until a galactic cordon was established by the Imperium, and each world within its confines to be evacuated and subjected to exterminatus. The decision condemned billions of Imperial citizens to extermination, which resulted in the slowing of the hive fleet.

Using a brood of captured Genestealers, the Imperium sent the Hive fleet into the Ork held Octavius system. The Orks of Octavius had been a thorn in the side of the Imperium for many generations, and defeating both the Orks and the Tyranids seemed to be the best course of action. The Genestealers impregnated so many orks that the entirety of Leviathan altered course for the system, to rendez-vous with their displaced kin. The Octavian Orks and Tyranids of Leviathan are still thoroughly involved with destroying each other; however, the Tyranids have accquired vast quantities of the highly modified Ork DNA, resulting in even larger assault organisms