However, it appears that much of the dialogue and story structure in the missions was designed for the space marines or the imperial guard and appear to have little relevance to the motivation of the Tyranids whose intention is simply to reassemble the swarm and then consume the subsector. Like many of the other races campaigns in Retribution the Tyranid campaign features the same missions in the same order. The opening scene of the Tyranid campaign features the Hive Lord beginning to rebuild the psychic link with the main Tyranid fleet, using splintered remnants of Hive Fleet Leviathan that were cut off during the Tyranid invasion of Sub-Sector Aurelia. The Hive Lord leads the swarm in their campaign to rebuild the psychic link with the main Tyranid fleet and finally consume Sub-Sector Aurelia in its entirety. When organized by the Hive Mind they are a lethal force that strikes system after system, stripping all life from planets in their path.

Cut off from the main Tyranid fleet, the Tyranids in Sub-Sector Aurelia are a scattered and disorganized nuisance at the start of their campaign in Dawn of War II: Retribution.

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