''From the dark depths of the [[Segmentum Pacificus]], a fresh alien threat stretches forth tendrils towards [[Holy Terra ]] itself. Seething [[Tyranid]] invasion swarms pour from the void in incalculable numbers, devouring world after world in their slow but relentless advance toward the [[Segmentum Solar]]. Resolved never to permit such horrors, the [[Imperium]]'s greatest war leaders rush to meet the [[xenos ]] invasion with a devastating counter-offensive of [[Solblade]] Fleets. Yet the [[Hive Mind ]] is possessed of infinite cunning and terrible hunger, and its plans may yet undo Humanity altogether…''{{Fn|2}}

This detailed background section gives an insight into the brutal conflict between the forces of the [[Imperium ]] and the [[Tyranid ]] [[Hive Mind ]] at the outset of the [[Fourth Tyrannic War ]] – which, if not stopped, could see [[Holy Terra ]] itself threatened by the [[Shadow in the Warp]]. From the re-emergence of [[Hive Fleet Leviathan]] to the desperate siege of the [[Bastior Sub-sector]] and the arrival of the [[Solblade ]] Fleets, the tale of this apocalyptic [[xeno]]-war is told through stories, maps, and terrifying illustrations.{{Fn|2}}

A showcase of Citadel miniatures painted by the 'Eavy Metal team, representing forces embroiled in the [[Fourth Tyrannic War ]] – hulking monsters, mighty war machines [[Imperial ]] heroes, and alien swarms alike. Each sweeping diorama includes narrative notes on that conflict and the combatants involved.{{Fn|2}}

A wealth of Crusade rules content to help you wage the [[Fourth Tyrannic War ]] on the tabletop, in a two-sided campaign for any number of players. It includes Battle Traits, Crusade Relics, Agendas, and Crusade Blessings, plus a pair of full upgrade paths for Monsters And Those Who Hunt Them – themed around the Tyrannic War, but usable by any faction.{{Fn|2}}

An array of 15 Crusade missions set on the battlefields of Sanctum and beyond, perfect for narrative games and your Tyrannic War campaign. Purge or protect gestation sacs as they hatch in Spawning Grounds, fight over a surrounded landing pad ahead of a Planetary Evacuation, and secure supplies as The Gathering Shroud of the [[Hive Mind]]'s presence grows in power.{{Fn|2}}

*{{Endn|1}}: [https://web.archive.org/web/20230506112032/https://www.warhammer-community.com/2023/04/29/what-else-is-in-leviathan-mission-cards-crusade-rules-and-a-big-ol-book/ warhammer Warhammer Community : What Else Is in Leviathan? Mission Cards, Crusade Rules, and a Big Ol’ Book (posted on 29/04/23April 2023)] ''(saved archive page, dated 06 May 2023, last accessed 30 March 2025, original link: https://www.warhammer-community.com/2023/04/29/04what-else-is-in-leviathan-mission-cards-crusade-rules-and-a-big-ol-book/23)''*{{Endn|2}}: [https://www.games-workshop.com/en-GB/warhammer-40000-tyrannic-war-2023-eng Games Workshop webstore : Crusade: Tyrannic War] (last accessed 24/06/23){{CME}}