Overview of the Leviathan Mission Deck
Chapter Approved: Leviathan Mission Deck dramatically expands Warhammer 40,000 gameplay, offering unprecedented variety and strategic depth through a wealth of new missions and rules.
This pack introduces a dynamic system where players navigate a Maelstrom of Battle, selecting from multiple mission objectives and adapting to ever-changing battlefield conditions.
What is the Leviathan Mission Deck?
The Leviathan Mission Deck, part of the Chapter Approved series, is a substantial expansion for Warhammer 40,000, designed to revolutionize how games are played. It’s not merely an addition, but a fundamental shift towards dynamic, unpredictable, and highly replayable battles. The core concept revolves around introducing a massive pool of mission objectives, rules, and tactical challenges.
Unlike previous systems with limited mission selection, Leviathan introduces Maelstrom of Battle mechanics, where players draw multiple mission cards, creating unique combinations each game. This ensures that no two battles are ever truly alike, forcing commanders to adapt their strategies on the fly. The deck contains 9 Primary Missions, 32 Secondary Missions (split between Attacker and Defender), 12 Mission Rules, and 8 Gambit cards, alongside Deployment cards and Objective Markers.
Core Components of the Deck
The Leviathan Mission Deck is comprised of several key elements working in concert to deliver its dynamic gameplay experience. At its heart are the 9 Primary Mission Cards, establishing the overarching objective for each battle. Complementing these are 32 Secondary Mission Cards – 16 for the Attacking force and 16 for the Defending force – offering diverse tactical goals to pursue throughout the game.
Further enhancing strategic depth are the 12 Mission Rules Cards, introducing unexpected twists and modifiers. 8 Gambit Cards (4 per side) allow players to play tactical maneuvers. Finally, 5 Deployment Cards dictate army placement, and 6 40mm Objective Markers are included for marking key locations on the battlefield, all supported by a comprehensive 10-page Rules Insert.

Mission Card Types
The Leviathan Deck features diverse card types: Primary Missions define core objectives, Secondary Missions offer tactical goals, and Gambit Cards introduce strategic plays.
Primary Mission Cards
Primary Mission Cards establish the fundamental objective for both players during a game of Warhammer 40,000. The Leviathan Mission Deck includes nine distinct Primary Mission cards, each presenting a unique overarching goal that dictates the core strategic focus of the battle.
These missions are selected at the beginning of the game and remain constant throughout, providing a central aim for both the Attacking and Defending forces. Examples involve securing key locations, eliminating specific enemy units, or controlling designated zones on the battlefield. Successfully completing the Primary Mission is crucial for achieving victory, often contributing a significant portion of the total victory points.
Secondary Mission Cards (Attacker & Defender)
Secondary Mission Cards add layers of tactical complexity to each game, offering diverse objectives for both the Attacking and Defending players. The Leviathan Mission Deck boasts 32 of these cards – 16 tailored for the Attacker and 16 for the Defender – allowing for highly asymmetric gameplay.
These missions are drawn throughout the battle, presenting dynamic goals that shift the strategic landscape. Attacker missions might involve deep strikes or eliminating specific targets, while Defender missions focus on holding key positions or disrupting enemy advances. Scoring these missions grants additional victory points, rewarding adaptable and opportunistic play.
Mission Rules Cards
Mission Rules Cards introduce unique twists and modifiers to standard Warhammer 40,000 gameplay, significantly altering battlefield dynamics. The Leviathan Mission Deck includes 12 of these cards, each presenting a distinct rule set that impacts movement, shooting, or other core mechanics.
These cards are often drawn alongside Primary Missions, creating unpredictable scenarios that demand tactical flexibility. Examples might include restrictions on reinforcements, altered terrain effects, or special scoring conditions. The inclusion of Chilling Rain adds an extra card draw, further amplifying the element of surprise and ensuring no two games feel alike.
Gambit Cards (Attacker & Defender)
Gambit Cards, totaling 8 within the Leviathan Mission Deck (4 for the Attacker and 4 for the Defender), represent hidden objectives and strategic maneuvers players can employ to gain an edge. These cards are kept secret until revealed, adding a layer of bluffing and counter-play to each game.
Attacker Gambits might focus on aggressive actions like rapid deployment or flanking maneuvers, while Defender Gambits could emphasize fortification or disrupting enemy advances. Successfully completing a Gambit grants bonus victory points, potentially swinging the outcome of a closely contested match. They encourage proactive decision-making and tactical adaptation.
Deployment Cards
The Leviathan Mission Deck includes 5 Deployment Cards, fundamentally altering how armies enter the battlefield. These cards move beyond standard deployment zones, introducing varied and challenging setups that demand adaptable strategies. Expect asymmetrical deployments, restricted entry points, or even forced deployments near specific terrain features.
These cards significantly impact early-game positioning and force players to reconsider traditional army compositions and movement tactics. They promote dynamic engagements and prevent predictable opening turns. Utilizing these cards effectively is crucial for gaining a tactical advantage and controlling key areas of the battlefield from the outset of the conflict.

Gameplay Mechanics with the Leviathan Deck
Leviathan introduces Dual Mission Selection, forcing strategic choices and adaptation. Players draw and apply multiple objectives, ensuring no two games are ever quite the same!
Maelstrom of Battle: Dual Mission Selection
The Maelstrom of Battle mechanic is a core innovation within the Leviathan Mission Deck, fundamentally altering how Secondary Missions are determined. Instead of selecting a single mission rule, players now randomly draw two additional cards – and a third if Chilling Rain is also in play – and apply the effects of both.
This dramatically increases the unpredictability and strategic depth of each game. Each Secondary Mission now has roughly a 20% chance of being selected during the draw, and the sheer number of possible combinations means replayability is exceptionally high. The likelihood of any specific combination occurring is around 2%, guaranteeing a unique experience every time, especially when combined with Tactical Missions for even greater variety.
Tactical Missions and Scoring
Tactical Missions introduce a dynamic scoring system within the Leviathan Mission Deck. Unlike standard Secondary Missions, a Tactical Mission is immediately discarded once it’s successfully scored, typically at the end of the player’s turn. This encourages aggressive play and rapid objective completion, shifting the focus towards immediate gains.
To maintain a consistent flow of objectives, players replenish their hand during each Command Phase. They draw enough cards from the Secondary Missions deck to ensure they always have two active Secondary Missions in front of them, ready to be pursued. This constant cycle of scoring and drawing keeps the game momentum high and forces continuous adaptation.
Drawing Secondary Missions
Maintaining a consistent flow of objectives is crucial in games utilizing the Leviathan Mission Deck. At the beginning of each player’s Command Phase, a vital step occurs: replenishing their Secondary Mission hand. Players draw cards from the Secondary Missions deck, ensuring they always have two active missions available to pursue throughout the turn.
This mechanic is particularly important in Tactical Missions, where objectives are discarded immediately upon scoring. The continuous draw ensures players aren’t left without targets, fostering dynamic gameplay and strategic adaptation. This constant cycle of acquisition and completion keeps the game engaging and prevents stagnation.

Components Included in the Pack
The Leviathan Mission Deck contains 9 Primary Mission cards, 32 Secondary Missions (16 Attacker/Defender), 12 Mission Rules, 8 Gambit cards, 5 Deployment cards, and 6 objective markers.
Physical Components: Cards
The core of the Leviathan Mission Deck lies within its extensive collection of cards, totaling 79 individual cards designed to reshape your Warhammer 40,000 battles. This includes nine Primary Mission cards, establishing the overarching goals for each game, and a substantial 32 Secondary Mission cards, split evenly between Attacker and Defender roles.
Players will also find 12 Mission Rules cards, introducing unique twists and conditions to the gameplay, alongside 8 Gambit cards – four for each side – offering tactical opportunities for strategic plays. Finally, five Deployment cards provide varied battlefield setups, ensuring no two games feel quite the same. These high-quality cards are essential for experiencing the full breadth of the Leviathan system.
Physical Components: Objective Markers
Complementing the extensive card collection within the Leviathan Mission Deck are six highly detailed 40mm Objective Markers. These robust markers are crucial for visually representing key locations on the battlefield, directly tied to the scoring of numerous Primary and Secondary Missions. Their larger size ensures clear visibility during intense gameplay, minimizing ambiguity and streamlining the objective-claiming process.
These markers aren’t merely functional; they add a tangible element to the strategic landscape, enhancing immersion and providing a focal point for conflict. They are designed to withstand repeated use, ensuring longevity and value within your Warhammer 40,000 collection, supporting countless battles to come.
Rules Insert
Essential for unlocking the full potential of the Leviathan Mission Deck, the included 10-page Rules Insert provides a comprehensive guide to the new rules and mechanics. This document meticulously details how to utilize the Primary, Secondary, Gambit, and Deployment cards, clarifying scoring procedures and resolving potential ambiguities; It explains the intricacies of the Maelstrom of Battle, ensuring players understand the dual mission selection process.
The insert also clarifies interactions with existing Warhammer 40,000 rules, particularly those found within the Core Book and Chapter Approved. It’s a vital resource for both seasoned veterans and newcomers alike, guaranteeing a smooth and enjoyable gaming experience.

Compatibility and Requirements
To utilize the Leviathan Mission Deck, a copy of the Warhammer 40,000 Core Book is essential, alongside integration with rules from Chapter Approved.
Warhammer 40,000 Core Book Requirement
The Leviathan Mission Deck is designed as a supplement to, not a replacement for, the core rules found within the Warhammer 40,000 Core Book. Players will need access to this foundational text to fully understand and implement the new rules and procedures introduced by the deck.
Specifically, the Core Book provides the essential framework for gameplay, including movement, shooting, assault, and the overall sequence of a battle. The Leviathan Deck builds upon this foundation, adding layers of strategic complexity through its diverse mission types and tactical objectives. Without the Core Book, interpreting and applying the deck’s content becomes significantly challenging, hindering a smooth and enjoyable gaming experience.
Integration with Chapter Approved
Chapter Approved: Leviathan Mission Deck seamlessly integrates with the broader Chapter Approved series, expanding upon the existing rules and content provided in previous installments. This deck isn’t a standalone product but rather a crucial addition to a growing ecosystem of supplementary materials designed to enhance the Warhammer 40,000 experience.
Players already familiar with Chapter Approved will find the Leviathan Deck’s structure and presentation intuitive. It builds upon established concepts, introducing new layers of tactical depth without fundamentally altering the core gameplay loop. Utilizing both resources together unlocks a truly customizable and dynamic gaming experience, offering unparalleled variety and replayability for seasoned veterans and newcomers alike.

Strategic Implications
The Leviathan Mission Deck fosters adaptable army builds and gameplay, demanding players prepare for diverse objectives and shifting battlefield dynamics, enhancing strategic depth.
Increased Game Variety
The Leviathan Mission Deck fundamentally alters the Warhammer 40,000 experience by introducing an astonishing level of variability. The core mechanic of drawing multiple mission cards – particularly within the Maelstrom of Battle – ensures that no two games will ever truly be alike. Players face a constantly shifting landscape of objectives, forcing them to deviate from pre-planned strategies and embrace adaptability.
The sheer number of possible combinations, with a 20% chance for each Secondary Mission to be drawn, guarantees a fresh challenge with every playthrough. This dynamic system, coupled with Tactical Missions, creates a truly unpredictable and engaging experience, pushing players to master a wider range of tactical approaches and army compositions.
Impact on Army Selection
The Leviathan Mission Deck significantly impacts army selection, demanding a more versatile approach to list building. The unpredictable nature of mission objectives discourages hyper-specialized armies, favoring forces capable of adapting to diverse scenarios. Players can no longer rely on a single, dominant strategy; instead, they must construct armies with multiple scoring avenues.
The increased variety necessitates considering units effective at both primary and secondary objectives. Armies excelling in mobility, objective control, or rapid response will gain a distinct advantage. This shift encourages experimentation and rewards players who prioritize flexibility over narrow specialization, fostering a more balanced and dynamic meta.
Adapting to Random Mission Objectives
The Leviathan Mission Deck forces players to master the art of adaptation. With a vast array of potential objectives, pre-game planning must evolve into dynamic in-game decision-making. The Maelstrom of Battle mechanic, drawing multiple mission cards, amplifies this challenge, demanding swift assessment and tactical adjustments.
Success hinges on a commander’s ability to identify key scoring opportunities and leverage their army’s strengths accordingly. Contingency planning becomes crucial, anticipating potential objective combinations and preparing for unexpected scenarios. Players must embrace flexibility and prioritize units capable of fulfilling diverse roles, turning randomness into an advantage.

Specific Mission Examples (Based on Available Information)
The Leviathan Deck features diverse Secondary Missions for both Attacker and Defender, scored throughout the game, adding layers of tactical complexity and strategic choice.
Examples of Attacker Secondary Missions
Attacker Secondary Missions within the Leviathan Mission Deck challenge players to aggressively pursue objectives across the battlefield, rewarding dynamic movement and calculated risks. These missions often center around controlling key areas, eliminating enemy units, or disrupting the defender’s plans. Examples include securing specific objectives for multiple turns, performing deep strikes within enemy territory, or successfully completing actions within the defender’s deployment zone.
Scoring these missions typically requires sustained pressure and tactical flexibility, forcing attackers to adapt their strategies based on the evolving game state. The variety ensures no two games feel alike, demanding players master diverse approaches to achieve victory. Successfully completing these missions grants valuable victory points, shifting the momentum in favor of the attacking force.
Examples of Defender Secondary Missions
Defender Secondary Missions in the Leviathan Mission Deck focus on strategic resilience and denying the attacker key advantages. These objectives often involve holding crucial positions, weathering enemy assaults, and disrupting the attacker’s advance. Examples include maintaining control of specific objectives for extended periods, successfully counter-attacking enemy incursions, or preventing the attacker from completing their own secondary missions.
Scoring these missions demands careful positioning, effective unit synergy, and a proactive defense. Defenders must anticipate the attacker’s moves and react accordingly, utilizing terrain and tactical maneuvers to their advantage. Successfully completing these missions provides vital victory points, bolstering the defender’s position and hindering the attacker’s progress.

Resources and Further Information
Chapter Approved: Leviathan Mission Deck is available for purchase at gaming stores and online retailers. Online communities and forums offer discussions and strategy tips.
Where to Purchase the Leviathan Mission Deck
Chapter Approved: Leviathan Mission Deck is readily available through a variety of channels, ensuring accessibility for all Warhammer 40,000 enthusiasts. Your local gaming stores are excellent starting points, offering the opportunity to support local businesses and potentially participate in in-store events related to the new missions.
Alternatively, numerous online retailers specialize in tabletop gaming products. Websites like Games Workshop’s official store, Amazon, and other dedicated hobby shops provide convenient purchasing options with shipping directly to your doorstep. Be sure to compare prices and shipping costs to find the best deal. Digital versions, or PDFs, may also become available through official channels or third-party providers, offering a convenient way to access the content on your preferred devices.
Online Communities and Discussion Forums
A vibrant community surrounds Warhammer 40,000, and the Leviathan Mission Deck is no exception. Numerous online platforms serve as hubs for discussion, strategy sharing, and rule clarifications. Dedicated Warhammer 40,000 forums, such as those hosted on Games Workshop’s website and independent fan sites, are excellent resources for engaging with fellow players.
Reddit’s r/Warhammer40k is a particularly active community, offering a space for asking questions, sharing battle reports, and discussing the nuances of the new missions. Social media platforms like Facebook also host numerous groups dedicated to the game. These communities often share insights, homebrew rules, and even links to helpful resources, including potential PDF versions of mission details and strategy guides.

Tyranid Synergy with the Leviathan Deck
Tyranids excel with the Leviathan deck due to their Synaptic Network, allowing flexible adaptation to varied objectives and maximizing scoring potential.
The Synaptic Network and Mission Objectives
The Tyranid Synaptic Network provides a unique advantage when navigating the diverse mission objectives presented within the Leviathan Mission Deck. This inherent biological structure allows for rapid adaptation and re-prioritization of targets based on the evolving battlefield situation and scoring opportunities.
Unlike other factions, Tyranids aren’t rigidly bound by pre-defined strategies. The Synaptic Network facilitates a fluid response to randomly drawn Secondary Missions, enabling commanders to efficiently shift focus towards objectives their army is best suited to accomplish. This adaptability is crucial in a system where the Maelstrom of Battle introduces unpredictable elements.
Furthermore, the Synaptic Network synergizes well with Bio-Titans, allowing for coordinated assaults on key objectives, maximizing their impact and ensuring efficient scoring. This combination makes Tyranids a formidable force in the new Leviathan era.
Bio-Titans and Data Sheets
The arrival of Bio-Titans significantly impacts Tyranid army composition and tactical options within the Leviathan framework. These colossal creatures, detailed in accompanying data sheets, represent a substantial investment but offer immense battlefield presence and objective control capabilities.
Their sheer size and resilience make them ideal for securing and holding contested zones, crucial for many Secondary Missions found within the Leviathan Mission Deck. However, effectively utilizing Bio-Titans requires careful consideration of deployment strategies and synergistic unit support.
Players must balance the power of these behemoths with the need for adaptable forces capable of responding to the unpredictable nature of the Maelstrom of Battle and diverse mission objectives. Accessing the released data sheets is essential for optimal army construction.
