This diorama was one of the displays at Warhammer World.
Responding to reports of alien-worshipping cults rising on Kitzu VII, Kayvaan Shrike leads his Raven Guard to reinforce the planet’s Imperial defenders. Upon arrival, the Space Marines discover a world already overrun by Tyranid monstrosities.
Determined to salvage something from the disaster, Shrike’s warriors hunt down and kill several of the evolved xenos beasts, harvesting bio-samples for future study. In danger of being surrounded and devoured, the Space Marines stage a fighting retreat across the Celestrus macro-viaduct, their Stormraven gunship moving to extract them.
Many of the Tyranid miniatures were from the (dismantled) Valedor diorama. The Valedor diorama showcased Eldar defending again the Tyranid hordes.