<p>As Hive Fleet Leviathan spreads across the galaxy, the eldar of Iyanden enact a desperate plan to stop a splinter of the fleet that could spell doom for the already-ravaged craftworld. Iyanna Arienal leads an armada of sinister wraithfighters and other deadly spacecraft to aid a human fleet in battling the tyranids - but her true motives may be far more sinister.</p>