Drifting through the void come star-eclipsing shoals of immense creatures whose cephalopodic forms bristle with spines and feeder tendrils. Each of these living vessels is host to thousands upon thousands of dormant warrior-forms, ready to wake from their slumber when the hive fleet locates its next meal.
Welcome to the rules section of Codex: Tyranids. Whether forging your own tales of glory and infamy with narrative play or pitting yourself against your opponents in nail-biting matched play contests, this page present all the rules you will need to bring your Tyranids collection to life on the tabletop.| Book | Kind | Edition | Version | Last update |
Warhammer 40,000: The App | ||||
Warhammer 40,000: The App | Rulebook | 11 | 2.7.1 | October 2026 |
Some Tyranids serve as synaptic conduits or nodal relays through which a portion of the Hive Mind’s iron will flows, overriding the natural instincts of the swarm to direct the teeming warrior-beasts to function as a single, gestalt organism on the battlefield.
If your Army Faction is TYRANIDS, while a TYRANIDS unit from your army is within 6" of one or more friendly SYNAPSE models, that TYRANIDS unit is said to be within Synapse Range of that model and of your army. While a TYRANIDS unit from your army is within Synapse Range of your army:Tyranids flood the battlefield with the psychic signature of the hive fleet - an icy, alien dread that gnaws at the minds of their prey and smothers even the most stalwart courage. When faced with such unfathomable horror, many are driven insane or suffer catastrophic neural damage.
If your Army Faction is TYRANIDS, once per battle, in either player’s Command phase, if one or more units from your army with this ability are on the battlefield, you can unleash the Shadow in the Warp. When you do, each enemy unit on the battlefield must take a Battle-shock test. Each time an enemy unit takes such a Battle-shock test, if it is within 6" of one or more SYNAPSE units from your army, subtract 1 from that test.| Q: | Can units targeted by the Shadow in the Warp army rule use the Insane Bravery Stratagem? |
| A: | No. Insane Bravery can only be used in your Command phase. |
The Hive Mind’s imperatives are clear: overcome the enemy. Drive them from their holdfasts and bury them with weight of numbers. Prepare this world for consumption.
1DPSo numerous and horrifying are the teeming organisms of the Vardenghast Swarm that mortal minds struggle to select targets amid the scrambling masses.
Enemy units’ ranged attacks that target a friendly VARDENGHAST SWARM INFANTRY unit not within 12" have -1 to hit rolls.Psychoclastic OverloadUPGRADE When a Psychophage’s retention sacs reach capacity, such a creature can vomit forth a stream of psychocorrosive particles large enough to erode the minds and bodies of an entire squad of enemy soldiers. VARDENGHAST SWARM PSYCHOPHAGE unit only. This unit can re-roll rolls to determine the A of a weapon. |
Adapted Organism Forged by the Hive Mind as a dedicated killer, this warrior organism possesses hyperattuned reflexes, plentiful fast-twitch muscle fibres and additional, ablative layers of chitinous plate. VARDENGHAST SWARM WINGED TYRANID PRIME model only.
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MELEE WEAPONS | RANGE | A | WS | S | AP | D | |
| Prime Talons | |||||||
| Prime Talons | Melee | 6 | 2+ | 6 | -1 | 2 | |
| ARMY RULES | Shadow in the Warp, Synapse |
RANGED WEAPONS | RANGE | A | BS | S | AP | D | |
| Barblauncher BLAST 1 Heavy | |||||||
| Barblauncher BLAST 1 Heavy | 24" | D6 | 4+ | 5 | 0 | 1 | |
MELEE WEAPONS | RANGE | A | WS | S | AP | D | |
| Chitinous Claws and Teeth | |||||||
| Chitinous Claws and Teeth | Melee | 1 | 4+ | 4 | 0 | 1 | |
| ARMY RULES | Shadow in the Warp, Synapse |
RANGED WEAPONS | RANGE | A | BS | S | AP | D | |
| Psychoclastic Torrent Ignores Cover Torrent | |||||||
| Psychoclastic Torrent Ignores Cover Torrent | 12" | D6 | 3+ | 6 | -1 | 1 | |
MELEE WEAPONS | RANGE | A | WS | S | AP | D | |
| Talons and Betentacled Maw Anti-Psyker 4+ Devastating Wounds | |||||||
| Talons and Betentacled Maw Anti-Psyker 4+ Devastating Wounds | Melee | 6 | 3+ | 6 | -2 | 2 | |
| ARMY RULES | Shadow in the Warp, Synapse |
RANGED WEAPONS | RANGE | A | BS | S | AP | D | |
| Fleshborer ASSAULT | |||||||
| Fleshborer ASSAULT | 18" | 1 | 4+ | 5 | 0 | 1 | |
MELEE WEAPONS | RANGE | A | WS | S | AP | D | |
| Chitinous Claws and Teeth | |||||||
| Chitinous Claws and Teeth | Melee | 1 | 4+ | 3 | 0 | 1 | |
| ARMY RULES | Shadow in the Warp, Synapse |
MELEE WEAPONS | RANGE | A | WS | S | AP | D | |
| Chitinous Talons | |||||||
| Chitinous Talons | Melee | 6 | 3+ | 5 | -1 | 1 | |
| ARMY RULES | Shadow in the Warp, Synapse |
The BATTLELINE keyword is used in the following The Vardenghast Swarm datasheets:
The CHARACTER keyword is used in the following The Vardenghast Swarm datasheets:
The FLY keyword is used in the following The Vardenghast Swarm datasheets:
The INFANTRY keyword is used in the following The Vardenghast Swarm datasheets:
The MONSTER keyword is used in the following The Vardenghast Swarm datasheets:
The SMOKE keyword is used in the following The Vardenghast Swarm datasheets:
The TYRANIDS keyword is used in the following The Vardenghast Swarm datasheets:
The VANGUARD INVADER keyword is used in the following The Vardenghast Swarm datasheets:
The VARDENGHAST SWARM keyword is used in the following The Vardenghast Swarm datasheets:
| Q: | If a unit has a rule that allows it to start an action when it is battle-shocked can it also continue doing that action if it becomes battle-shocked after starting an action? |
| A: | Yes |
| Q: | If a unit becomes battle-shocked after starting an action does it stop performing that action? |
| A: | Yes |
The VARDENGHAST SWARM and INFANTRY keywords are used in the following The Vardenghast Swarm datasheets:
Many deadly weapons can inflict fatal injuries on any foe, no matter their resilience.
Each time an attack made with a [LETHAL HITS] weapon results in a critical hit, you can choose for that attack to automatically wound the target.



| Q: | When checking line of sight from one model to another, is this drawn between the bases of those models, or between any part of them? |
| A: | Line of sight is drawn from any part of the observing model to any part of the model being observed. |
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| Q: | My attack has a rule that means it results in a critical hit on a hit roll of 4+. Does this work when snap shooting? |
| A: | Unless otherwise stated, no: when snap shooting, each attack only hits on a roll of 6. |
| Q: | My attack has a rule that means it results in a critical hit on a hit roll of 4+, and I would otherwise need a 5+ to hit. Does a 4+ hit? |
| A: | Yes, except when snap shooting: when snap shooting, each attack only hits on a roll of 6. |
| Q: | When declaring the allocation order of groups in my unit I have more than one non-CHARACTER groups that contain a model with a missing wound, how must I select the order? |
| A: | Those groups can be selected in an order of your choosing but must be in an order that makes them come before any non-CHARACTER groups that do not contain a model with a missing wound. |
| Q: | I have a unit being attacked with weapons that will modify some of their save rolls to be worse then 6 should I make those save rolls? |
| A: | Yes, because other models in your unit may have Sv’s that are better those models you’ve mentioned, this means that enough save rolls could be allocated to the those models that the rest of the results are not greater then the Sv’s of the other models in your unit. |
| Q: | Can I group or allocate a wound to a destroyed model? |
| A: | No. |
| Q: | Is being within range of a terrain objective the same as being within range of an objective marker? |
| A: | Yes. |
| Q: | If my unit has taken control of an objective at the end of my movement phase and that unit has as an ability that secures an objective they control, can they secure that objective? |
| A: | Yes |

| Q: | Does my model or unit become engaged while moving through a enemy units engagement range during a move? |
| A: | No |
Tyranids flood the battlefield with the psychic signature of the hive fleet - an icy, alien dread that gnaws at the minds of their prey and smothers even the most stalwart courage. When faced with such unfathomable horror, many are driven insane or suffer catastrophic neural damage.
If your Army Faction is TYRANIDS, once per battle, in either player’s Command phase, if one or more units from your army with this ability are on the battlefield, you can unleash the Shadow in the Warp. When you do, each enemy unit on the battlefield must take a Battle-shock test. Each time an enemy unit takes such a Battle-shock test, if it is within 6" of one or more SYNAPSE units from your army, subtract 1 from that test.| Q: | Can units targeted by the Shadow in the Warp army rule use the Insane Bravery Stratagem? |
| A: | No. Insane Bravery can only be used in your Command phase. |
Some Tyranids serve as synaptic conduits or nodal relays through which a portion of the Hive Mind’s iron will flows, overriding the natural instincts of the swarm to direct the teeming warrior-beasts to function as a single, gestalt organism on the battlefield.
If your Army Faction is TYRANIDS, while a TYRANIDS unit from your army is within 6" of one or more friendly SYNAPSE models, that TYRANIDS unit is said to be within Synapse Range of that model and of your army. While a TYRANIDS unit from your army is within Synapse Range of your army:Weapons powered by unstable and dangerous energy sources pose a substantial risk to the wielder and those that stand beside them.
Each time a unit is selected to shoot or selected to fight, after that unit has resolved all of its attacks, make a number of hazard rolls (06.03) for that unit equal to the number of [HAZARDOUS] weapons you selected in the Select Weapons step.
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| Q: | I have a rule that triggers when a mortal wound is allocated to a model, when does this happen? |
| A: | When you select a model in the Select Model step of Mortal Wounds (06.02). |
| Q: | I failed hazard rolls from [Hazardous] weapons, do those mortal wounds have to be allocated to the models with the [HAZARDOUS] weapons? |
| A: | No, you allocate the mortal wounds to the unit as per Mortal Wounds (06.02). (This represents Bob the guardsmen picking up his fallen squad mates plasma gun or that the twisting power of James the Chaos Sorcerer pulling his followers into the warp.) |
| Q: | If a rule says my unit must make a hazard roll does every model in the unit make a hazard roll? |
| A: | No, the unit would make 1 single hazard roll. |
The most potent weapons strike with such power that they make a mockery of armour and can cleave through several foes.
Each time an attack made with a [DEVASTATING WOUNDS] weapon results in a critical wound, the attack sequence for that attack ends and the target unit suffers a number of mortal wounds equal to the D characteristic of that weapon. These are inflicted after resolving any normal damage inflicted by those attacks.
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Precision attacks can pick high-value targets out in a crowd.
While resolving attacks made with one or more [PRECISION] weapons, at the start of the Allocation Order step (05.03), if the target unit contains one or more CHARACTER models visible to one or more of the attacking models, the active player can select one allocation group that contains one of those visible CHARACTER models. If they do, until those attacks are resolved, or until that CHARACTER group is destroyed (whichever happens first), that CHARACTER group is the current allocation group.Those possessed of lightning-fast reactions may strike before the opponent can react.
While every model in a unit has this ability, that unit is a Fights First unit.So numerous and horrifying are the teeming organisms of the Vardenghast Swarm that mortal minds struggle to select targets amid the scrambling masses.
Enemy units’ ranged attacks that target a friendly VARDENGHAST SWARM INFANTRY unit not within 12" have -1 to hit rolls.Forged by the Hive Mind as a dedicated killer, this warrior organism possesses hyperattuned reflexes, plentiful fast-twitch muscle fibres and additional, ablative layers of chitinous plate.
VARDENGHAST SWARM WINGED TYRANID PRIME model only.
High-explosive rounds can fell several warriors in a single blast, but firing them too close to comrades is unwise.
Each time you gather attack dice for a [BLAST] weapon, add one additional attack dice for every five models that were in the target unit in the Select Targets step (rounding down).Heavy weapons are amongst the biggest guns on the battlefield, but require bracing to fire at full effect.
In your Shooting phase, each time an attack is made with a [HEAVY] weapon, add 1 to the hit roll if all of the following apply to the attacking unit:
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The hardiest warriors refuse to be laid low, even by wounds that should by all rights prove lethal.
This ability always takes the form Feel No Pain X+. Each time a model with this ability would lose a wound, roll one D6: on an X+, that wound is not lost.| Q: | Are models that are within the boundary of a terrain area, but not on the ground floor of a terrain area (e.g. overhanging parts of FRAME VEHICLES or models on terrain features that are within that terrain area) within that terrain area? |
| A: | Yes |
| Q: | When my unit shoots at another unit, how does it work if some models in the target unit are fully visible to some models in my unit, while others are within a terrain area/not fully visible? |
| A: | For each attacking model in your unit, determine whether the target unit has the benefit of cover, as described in Terrain and Visibility. In this scenario, the target unit will likely have the benefit of cover against some of the attacking models, but not all. This means that, in an example unit where all attacking models are using the same weapon, when you get to the Resolve Attacks step of the Attack Sequence, you will collect dice for attacks made by models against which the target unit has the benefit of cover separately from the dice for attacks made by models against which the target unit does not have the benefit of cover. |
The stealthiest warriors can evade the attentions, and the bullets, of their foes.
If every model in a unit has this ability, each time a ranged attack targets that unit, that unit has the benefit of cover against that attack (13.08).Some weapons are designed to root enemy formations out of entrenched positions.
Each time an attack is made with an [IGNORES COVER] weapon, the target cannot have the benefit of cover against that attack (13.08), including from rules that give a model or unit the benefit of cover (e.g. Stealth).Torrent weapons project clouds of fire, gas or other lethal substances that few foes can hope to evade.
Each time an attack is made with a [TORRENT] weapon, that attack automatically hits the target.Certain weapons are the bane of particular foes.
This ability always takes the form [ANTI-X Y+]. Each time an attack is made with an [ANTI] weapon, if the target unit has the keyword denoted by X, an unmodified wound roll of Y+ is a critical wound.When a Psychophage’s retention sacs reach capacity, such a creature can vomit forth a stream of psychocorrosive particles large enough to erode the minds and bodies of an entire squad of enemy soldiers.
VARDENGHAST SWARM PSYCHOPHAGE unit only. This unit can re-roll rolls to determine the A of a weapon.
Folding stocks, shortened barrels or lightweight construction enable some weapons to be easily fired on the move.
Units containing one or more models with an [ASSAULT] weapon can shoot using assault shooting (10.05).