Editing Codex - Tyranids: /tg/ edition (section)

== Army wide rules ==
'''Know No Honor:''' ''Tyranids do not have a concept of honour or subordinates to impress.'' Character models with this rule may not issue or accept challenges, but suffer no penalties for refusing a challenge.

'''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, Daemon, Brotherhood of Sorcerers, or Brotherhood of Psykers special rules suffer a -2 penalty to their Leadership whilst they are within shadow in the warp range. Additionally, any enemy psykers in range attempting to harvest Warp Charges receive a -1 to each die roll.

'''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===
Individual Tyranid creatures function as tendrils of the gestalt Hive Mind; however, outside of its influence they revert to highly evolved animal instincts befitting apex predators. At the beginning of the Tyranid turn, roll a Leadership test for each unengaged Tyranid unit outside of Synapse range; each will act as normal if they pass. If not, they assume natural survival or attack patterns based on their rules matching the descriptors below:

*'''Lurk:'''
**The brood immediately seeks the nearest cover, be it ruins, buildings, or other terrain. It may shoot only if it has reached said cover; otherwise, it must continue to the nearest cover by using a Run move. It may not charge in the Assault phase. The unit gains the Stealth special rule.
**'''Synaptic Bonus - Sensory Synchronization:''' The unit gains the Stealth special rule.

*'''Hunt:'''
**The brood must shoot at the nearest enemy unit to which they have line of sight and may not charge in the Assault phase. The unit gains the Preferred Enemy special rule.
**'''Synaptic Bonus - Collective Guidance:''' The unit gains +1 BS.

*'''Feed:'''
**The unit may not Run or Shoot, but must charge the nearest viable enemy unit in the Assault phase. It also gains the Rage special rule.
**'''Synaptic Bonus - Neurokinetic Acceleration:''' The unit gains +1 A.