Editing Codex - Tyranids: Hungry Swarmhost Edition (section)

== Army wide rules ==
'''Know No Honor:''' ''Tyranids do not have a concept of honour nor any subordinates to impress.'' Character models with this rule may not issue or accept challenges, but suffer no penalties for refusing a challenge.

'''Instinctive Behaviour:''' This special rule is always followed, in brackets, by a type: either Lurk, Hunt or Feed, which corresponds to a table opposite. At the beginning of each of your turns, all Codex: Tyranids units with this special rule that are outside of the synapse range of any friendly Synapse Creatures (see below) must take a Leadership test unless they are: engaged in combat, falling back, have gone to ground or arrived from reserve this turn. If the test is passed, the unit acts normally during this turn. If the test is failed, the unit must roll a D6 on the appropriate Instinctive Behaviour table. The effects of the result rolled last until the beginning of your next turn, unless specified otherwise. If ''all'' the models in the unit with this rule are within synapse range, they may take a Leadership test at the start of their Movement phase; if they pass they gain specific benefits, specified in the Synaptic Bonus line of the Instinctive Behaviour table.

'''Instinctive Fire:''' Each weapon on this model automatically fires at the nearest enemy unit within range and line of sight as if it were attached like a vehicle. The shots are resolved at the end of the Shooting phase before Morale checks are taken. Each weapon can fire at a different target unit, but they cannot be fired in any other way or at any other time.

'''Shadow in the Warp:''' Models with the Shadow in the Warp special rule have a shadow in the warp range identical to their Synapse range (below). All enemy units and models with the Psyker, Psychic Pilot or Brotherhood of Psykers special rules suffer a -3 penalty to their Leadership whilst they are within shadow in the warp range. At the start of his Psychic phase opponent player must roll a D6 for each his Psyker unit within shadow in the warp range, and lose a Warp Charge from his pool for each result of 1 or 2.

'''Synapse:'''
Models with the Synapse Creature special rule have a synapse range of 12". Friendly Codex: Tyranids models within this synapse range, including the Synapse Creatures themselves, have the Fearless special rule. If a unit from Codex: Tyranids is falling back and at least one of the unit’s models is within a friendly Synapse Creature’s synapse range before the unit moves, the unit automatically Regroups. In addition any units with instinctive behavior get the Synaptic Bonus based on their 
instinctive behavior.

===Instinctive Behaviour===
*'''Lurk:'''
**'''1-2 - Survive:''' The unit is treated as having failed a Morale test and must immediately Fall Back.
**'''3-5 - Seek Cover:''' In the Movement phase, the unit is not slowed by difficult terrain, though its models must take Dangerous Terrain tests as normal. In the Shooting phase, the unit can Run, but it can only shoot if it is in a building or area terrain (if the unit is partially within area terrain, only those models within area terrain are allowed to shoot). The unit cannot charge in the  Assault phase.
**'''6  - Stalk:''' This follows all the rules for Seek Cover (above). In addition, the unit gains the Stealth special rule.
**'''Synaptic Bonus - Sensory Synchronization:''' The unit gains the Stealth special rule.

*'''Hunt:'''
**'''1-2 - Burrow and Hide:''' The unit immediately Goes to Ground. Units that contain at least one model with the Fearless special rule treat this result as Prowl (below), instead.
**'''3-5 - Prowl:''' In the Shooting phase, the unit cannot Run and must instead shoot at the closest enemy unit that is within range and line of sight of at least one model in the Tyranid unit. If there is no viable target, the Tyranid unit can do nothing during the Shooting phase. The unit cannot charge in the Assault phase.
**'''6 - Destroy:''' This follows all the rules for Prowl (above). In addition, the unit gains the Preferred Enemy special rule.
**'''Synaptic Bonus - Collective Guidance:''' The unit gains +1 BS

*'''Feed:'''
**'''1-2 - Cannibalistic Hunger:''' The unit immediately suffers a number of hits equal to the number of models in that unit. These hits are resolved using the unit’s majority Strength (if drawn, use the highest) and AP-. Wounds are allocated by the owning player and armour saves (but not cover saves) may be taken. After resolving casualties (if any) the unit can do nothing else until the end of its turn. Units consisting of only a single model treat this result as Devour (below), instead.
**'''3-5 - Devour:''' In the Shooting phase, the unit cannot shoot or Run. In the Assault phase, if the unit is able to declare a charge, it must do so against the closest viable enemy unit. If the unit cannot declare a charge, it does nothing in the Assault phase.
**'''6 - Kill:''' This follows all the rules for Devour (above). In addition, the unit gains the Rage special rule.
**'''Synaptic Bonus - Neurokinetic Acceleration:''' The unit gains +1 A.