Editing Codex - Tyranids: /tg/'s 8th Edition (section)

===Bio-Artefacts===
====Universal====
*'''Arachnacyte Gland:''' ''The Arachnacyte Gland clutches the spine of its host bioform, its multi-limbed tendrils becoming wedded to the creature’s own flesh. Through these, the bio-artefact floods its host’s nervous systems and organs and lashes it with psychic stimuli, driving the beast on ever faster.''
::Model with Adrenal Glands only. When a charge roll is made for a model with this Relic, roll one additional D6 and discard one of the dice.

*'''Maw Claws of Thyrax:''' ''During the destruction of Thyrax, the dread beast that spearheaded the assault bore a pair of symbiotic fang-lined pincers. These terrible claws consumed both the bodies and the memories of their victims, passing on the assimilated knowledge to the host creature.''
:: Model with Rending Claws, Monstrous Rending Claws or Patriarch Claws only. Add the following to that weapon’s special rule: 'When this model slays an enemy model in the Fight phase, you can re-roll failed hit rolls in all subsequent Fight phases for this model.' In addition, consider the results of the wound rolls made by a model with the Maw Claws of Thyrax as 1 higher to see if the weapon's special rule activates.

*'''Norn Crown:''' ''First named by Inquisitor Kryptman, the Norn Crown is a unique parasitic organism that burrows needle-like cerebral bores directly into the brain of its host, forming a neuro-synaptic link that acts as a hyper-conduit for the Hive Mind. Through this abhorrent union, the Hive Mind’s indomitable will can pour forth to augment and control the hordes of lesser Tyranids that scuttle in the leader-beast’s wake.''
:: Friendly {{W40kKeyword|<HIVE FLEET>}} units do not suffer the penalties to their hit rolls and charge rolls incurred from the Instinctive Behaviour ability whilst they are within 30" of this model. In addition, this model gains the {{W40kKeyword|Psyker}} keyword and can attempt to manifest one additional psychic power in its Psychic phase.

*'''Pathogenesis:''' ''An organism like no other, Pathogenesis is perhaps a throwback to the Tyranids’ genetic origins or a shadow of things to come. Though its motes of psychic awareness are diffused throughout its carrier like a virus, it acts with a singular will. Subverting the body and symbiotes of its host, Pathogenesis causes rapid mutation: cartilaginous tubes and containment spines are lengthened; intercostal muscles are engorged; bio-ammunition are sheathed in a toxic dermis. With its host’s reach and lethality extended, fragments of Pathogenesis can reach out to the bodies of many more prey, by infesting the bio-ammunition or riding through the bio-electric charge. Whether it aims only to spread itself or is actively seeking something in the bodies of its fallen foes, perhaps only time will tell.''
::Add 8" to the Range characteristic of ranged weapons a model with this Relic is equipped with. In addition, when a model with this Relic fires Overwatch or is chosen to shoot with, you can re-roll a single hit roll and you can re-roll a single wound roll.

'''Resonance Barb:''' ''Within the crowning carapace of this creature are pulsing bundles of nerves, their tendrils driven irreversibly into the beast’s cortex. The Resonance Barb throbs at sympathetic frequencies with the Hive Mind, transmitting a portion of its cosmic might into the creature’s flesh-form.''
:: {{W40kKeyword|Psyker}} model only. A model with this Relic can attempt to manifest one additional psychic power in your Psychic phase and attempt to deny one additional psychic power in your opponent’s Psychic phase. In addition, when a Psychic test is taken for a model with this Relic, add 1 to the total.

*'''The Hungering Carapace:'''
:: This model's armour save is improved by one step. Each time you roll a wound roll of 6+ for a melee attack made by its bearer, the target suffers a mortal wound in addition to any other damage; for every model slain by these mortal wounds, the bearer regains a wound lost previously in the battle.

*'''The Miasma Cannon:''' ''The Tyranids utilise all manner of bio-weapons, but none evoke more dread than the Miasma Cannon. Unlike other venom cannons, this weapon fires gobbets of toxin-laden slime so virulent that it reduces organic targets into shapeless puddles of goo in seconds.''
:: Model with Heavy Venom Cannon only. The Miasma Cannon replaces the model's Heavy Venom Cannon.
::{| class=wikitable
|- valign=top
! Weapon !! Range !! Type !! S !! AP !! D !! Abilities 
|-
|'''The Miasma Cannon''' || - || - || - || - || - || Choose one of this weapons profiles before firing.
|-
|'''Miasmic Spit''' || 36" || Assault D3 || 10 || -3 || 3 || This weapon always wounds on a 2+, unless the target is a {{W40kKeyword|VEHICLE}}.
|-
|'''Miasmic Spray''' || 8" || Assault D6 || 7 || -2 || 2 || This weapon always wounds on a 2+, unless the target is a {{W40kKeyword|VEHICLE}}. This weapon automatically hits its target.
|}

*'''The Psyleech Venom Cannon:'''
:: Model with Heavy Venom Cannon only. The The Psyleech Venom Cannon replaces the model's Heavy Venom Cannon.
::{| class=wikitable
|- valign=top
! Weapon !! Range !! Type !! S !! AP !! D !! Abilities 
|-
|'''The Psyleech Venom Cannon''' || - || - || - || - || - || Choose one of this weapons profiles before firing.
|-
|'''Single Shot''' || 36" || Assault 1 || 9 || -3 || 2 || You can add 1 to the wound rolls if the target unit has the {{W40kKeyword|Psyker}}, {{W40kKeyword|Daemon}} or {{W40kKeyword|Chaos}} keyword. In addition, the enemy must subtract 2 from invulnerable saves made against hits caused by this weapon.
|-
|'''Salvo''' || 36" || Assault D6 || 5 || -2 || 1 || You can add 1 to the wound rolls if the target unit has the {{W40kKeyword|Psyker}}, {{W40kKeyword|Daemon}} or {{W40kKeyword|Chaos}} keyword. In addition, the enemy must subtract 2 from invulnerable saves made against hits caused by this weapon.
|}

*'''The Reaper of Obliterax:''' ''The Reaper of Obliterax, first encountered amongst the re-emergent swarms of Hive Fleet Jormungandr, is a sentient blade resembling a bonesword that discharges highly concentrated bursts of destructive energy. Even the lightest blow from this bio-weapon can result in its target being rent asunder.''
:: Model with Lash Whip and Bonesword or Lash Whip and Monstrous Bonesword only. Add the following to that weapon’s Abilities: 'On a wound roll of 6+, this weapon inflicts double damage.' In addition, a model equipped with the Reaper of Obliterax has a 4+ invulnerable save.

*'''The Venomthorn Parasite:''' ''These engorged bio-ammunition tubes are only the outer form of an ancient symbiotic intelligence that spreads its nerve endings like a fungus throughout both creature and weapon, neurally linking the three together. When it senses prey, the Venomthorn Parasite dominates its two hosts, pushing the weapon symbiote to its limit with pulses of hormonal stimuli until the target is eviscerated.'
::Model equipped with a stranglethorn cannon and/or heavy venom cannon only. When this model shoots with a stranglethorn cannon or heavy venom cannon, do not roll any dice when determining the Type characteristic of that weapon; instead, it has the maximum value (e.g. a Heavy D6 weapon makes 6 attacks). In addition, add 1 to the wound rolls when firing with that weapon.

*'''The Ymgarl Factor:''' ''The Ymgarl Genestealers have long been a cancerous blight on the worlds of the Imperium. Their insatiable voracity is legend amongst those that have had the misfortune to encounter them and live. Now, dark rumours have surfaced of Tyranid leader-beasts that appear to share the unfathomable adaptability of the Ymgarl Genestealers.''
:: At the start of its movement phase, a model with the Ymgarl Factor must alter their form into one of the three listed below. The bonus gained lasts until the start of its next movement phase. The same form cannot be chosen in two consecutive turns. 
::*'''Slashing Claws:''' The model has +D3 Strength.
::*'''Tentacled Limbs:''' The model has +D3 Attack.
::*'''Muscled Carapace:''' The model has +D3 Toughness.

*'''Xenogenic Acid:''' ''This oily black substance continually seeps from the swollen cysts of its carrier. Splashes of the liquid have been seen to flow against gravity towards horrified eyes or compromised armour plates, giving rise to speculation that the acid itself is sentient. Within moments, the horrifying effluence finds its way inside its victims, breaking down the prey’s genetic structure and molecular cohesion until all that is left is a bubbling pile of black bio-matter.''
::Model with Toxin Sacs only. When resolving a melee attack made by a model with this Relic, an unmodified wound roll of 5+ inflicts 1 mortal wound on the target in addition to any other damage.

====Hive Fleet-Specific====
*'''{{W40Kkeyword|Behemoth}} - Scythes of Tyran:''' ''The few remaining records of the fall of Tyran speak of an alpha beast that led the assault upon Magos Varnak’s command bunker, tearing open the facility’s vast bulkhead doors with a single slash of its scything forelimbs. So sharp were these monomolecular-edged weapon-growths that several Skitarii defenders were bisected with the alpha beast's every frenzied swipe.''
::{{W40Kkeyword|Behemoth}} model with Monstrous Scything Talons only. The Scythes of Tyran replaces the model's Monstrous Scything Talons.
::{| class=wikitable
|- valign=top
! Weapon !! Range !! Type !! S !! AP !! D !! Abilities 
|-
|'''Scythes of Tyran''' || Melee || Melee || +2 || -3 || 3 || You can re-roll hit rolls of 1 when attacking with this weapon. This model can make 1 additional attack with this weapon each time it fights. In addition, each time you make a hit roll of 6+ for this weapon, you can make an additional hit roll. These additional hit rolls cannot generate further additional hit rolls.
|}

*'''{{W40Kkeyword|Gorgon}} - Hyper-Adaptive Biology''' ''Leader-beasts spawned by Hive Fleet Gorgon possess an intricate array of bizarre, transmutative organs, each of which can reform itself in mere moments to respond to any internal trauma.''
::{{W40Kkeyword|Gorgon}} model only. From the end of the first phase in which this model suffers any wounds, add 1 to its Toughness and roll a die each time the model suffers an unsaved wound; for the remainder of the battle, on a roll of 5+ that wound is not lost.

*'''{{W40Kkeyword|Hydra}} - Slimer Maggot Infestation:''' ''Rather than individual organisms, this deathspitter fires a wad of self-replicating slimer maggots. Upon striking their target, these ravenous creatures burrow deep into its flesh before beginning the process of fragmentation and regeneration. Within moments, the host body is devoured from the inside by a wriggling mass of grubs.''
::{{W40Kkeyword|Hydra}} model with two Deathspitters with Slimer Maggots only. The Slimer Maggot Infestation replaces the model's two Deathspitters with Slimer Maggots. In addition, this model and every {{W40Kkeyword|Hydra}} unit within 6" may re-roll every wound roll during the Shooting Phase.
::{| class=wikitable
|- valign=top
! Weapon !! Range !! Type !! S !! AP !! D !! Abilities 
|-
|'''Slimer Maggot Infestation''' || 24" || Assault 6 || 7 || -1 || 1 || -
|}

*'''{{W40Kkeyword|Jormungandr}} - Infrasonic Roar:''' ''Some Jormungandr bio-colossi utilise a complex arrangement of acoustic organs to unleash fearsome infrasonic bellows. So powerful are these booming sonic emanations that they cause a primal terror and confusion in many sentient species.''
::{{W40Kkeyword|Jormungandr}} model only. Enemy units within 12" of this model must subtract 1 from their Leadership.

*'''{{W40Kkeyword|Kraken}} – Chameleonic Mutation:''' ''This chitinous plate armour is an adaptation of the chameleonic carapace common to the Lictor bioform. Sub-dermal crystals capture and redirect light, projecting an ever-shifting mirage that masks the host creature’s movements.''
::{{W40Kkeyword|Kraken}} model only. Your opponent must subtract 1 from their hit rolls for attacks that target this model. In addition, add 2 instead of 1 to saving throws for this model when it is in cover.

*'''{{W40Kkeyword|Kronos}} - Balethorn Cannon:''' ''This enormous bio-cannon spits out a web of hyper-adaptive microfilament. Upon contact with the target, this sentient substance begins to contract, its contra-empathic surface identifying and adapting to any defences it encounters, flaring white-hot to burn through kinetic shielding, or sharpening to a monomolecular edge to slice through even the thickest power armour.''
::{{W40Kkeyword|Kronos}} model with a Stranglethorn Cannon only. The Balethorn Cannon replaces the model's Stranglethorn Cannon.
::{| class=wikitable
|- valign=top
! Weapon !! Range !! Type !! S !! AP !! D !! Abilities 
|-
|'''Balethorn Cannon''' || 36" || Assault D6 || 7 || -2 || 2 || You can add 1 to hit rolls for this weapon when attacking a unit with 10 or more models. A unit that suffers one or more wounds from this weapon must subtract 3 from its movement, advance and charge distances. Invulnerable saves cannot be taken against this weapon.
|}

*'''{{W40Kkeyword|Leviathan}} - Slayer Sabres:''' ''At the hilt of each of these enormous, curving blades is a shell of diamond-hard chitin. This houses the brain of the weapon-symbiote, a semi-sentient organism which forms a synaptic link with its bearer. With a mental command, the wielder can generate a powerful surge of psychic energy, a fraction of the full power of the Shadow in the Warp that incinerates the unfortunate victim from the inside out.''
::{{W40Kkeyword|Leviathan}} model with Monstrous Boneswords only. The Slayer Sabres replace the model’s Monstrous Boneswords.
::{| class=wikitable
|- valign=top
! Weapon !! Range !! Type !! S !! AP !! D !! Abilities 
|-
|'''Slayer Sabres''' || Melee || Melee || User || -2 || 3 || A model armed with the Slayer Sabres can make 1 additional attack with them in the Fight phase. Each time you roll a wound roll of 6+ for this weapon, the target suffers a mortal wound in addition to any other damage. In addition, if an {{W40Kkeyword|Infantry}} or {{W40Kkeyword|Biker}} model suffers damage from this weapon but is not slain, roll a D3 at the end of the Fight phase. If the result is greater than that model’s remaining number of wounds, it is slain.
|}