npc_headcrab_black
(Redirected from Poison headcrab)
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 Class hierarchy
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| CBlackHeadcrab |
| npc_headcrab.cpp
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Not to be confused with npc_headcrab_poison (the Half-Life: Alyx entity).
npc_headcrab_black is a point entity available in 
Half-Life 2, 
Half-Life 2: Episode One, 
Half-Life 2: Episode Two, 
Half-Life 2: Deathmatch, and 
Black Mesa.
Black headcrabs, also known as poison headcrabs, are a headcrab variant. Upon biting the player, this NPC temporarily reduce the player's health to 1. They are best used in tandem with other melee NPCs like regular headcrabs to make fighting more intense. However, it is risky to group them near NPCs with ranged attacks, as the player will die very easily. In fact, many players are conditioned to kill black headcrabs first because of the threat they pose compared to other enemies.
Commonly found in groups covering a single host poison zombie which hurls its parasite cargo towards the player, they can make a formidable foe so should be placed carefully. Killing the poison zombie will not necessarily kill any of the headcrabs it is carrying, much less all of them (the sole exception may be AR2 secondary fire energy balls). They are also quite resistant to fire and will attack while burning.
Since they are incapable of actually killing the player (only reducing it to 1), they are also often used as a "jumpscare" by themselves to spook the player.
AltNames: This entity is also tied to npc_headcrab_poison. 
Note:Some keyvalues, spawnflags, effect flags, inputs, or outputs might not affect an NPC, based on the functionality and coding of the NPC.Note:In Black Mesa can kill player if the difficulty level is maximum, unlike Half-Life 2.
Confirm:Keyvalues
- Name (targetname) <string>
- The name that other entities refer to this entity by, via Inputs/Outputs or other keyvalues (e.g.
parentnameortarget).
Also displayed in Hammer's 2D views and Entity Report.See also: Generic Keyvalues, Inputs and Outputs available to all entities
BaseHeadcrab:
- Start burrowed (startburrowed) <boolean>
- Should this npc start burrowed? Will unburrow via input or if an enemy gets near.
Bug:Black headcrabs lack the animations for un/burrowing (only classic headcrabs have them). Due to the specifics of their AI, they will never unburrow if this keyvalue is used. [todo tested in ?]|
CBaseCombatCharacter:
CAI_BaseNPC:
DamageFilter:
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Flags
- Start hidden : [65536]
- Start hanging from ceiling : [131072]
BaseNPC flags
- Wait Till Seen : [1]
- Prevents this NPC from seeing (or being seen) until it enters a player's viewcone.
- Gag : [2]
- Won't make IDLE sounds until it's angry.
- Fall to ground (unchecked means teleport to ground) : [4]
- Drop Healthkit : [8]
- Causes this NPC to drop an item_healthvial upon dying.
- Efficient : [16]
- Don't acquire enemies or avoid obstacles
- Wait For Script : [128]
- Forces this NPC to "wait" in an idle state until it finishes playing a scripted_sequence.
- Long Visibility/Shoot : [256]
- By default, increases a NPC's sight range to
6,000units and allows it to attack from anywhere within that distance.
- Fade Corpse : [512]
- Think outside PVS : [1024]
- Allows this NPC to run its regular AI outside of any player's PVS.
- Template NPC : [2048]
- Marks this NPC as a template for entities like npc_template_maker. The NPC will not spawn on its own. This is not needed for point_template.
- Do Alternate collision for this NPC (player avoidance) : [4096]Note:This flag is disabled in episodic for player companions, because the
StartScriptinginput does this.
- Don't drop weapons : [8192]
- Ignore player push : [16384] (in all games since
) - Entity won't give way to player.
Inputs
- Burrow !FGD
- Burrow. If no burrow points within 512 units, does nothing.
- BurrowImmediate !FGD
- Burrow immediate.
- Unburrow !FGD
- Unburrow.
- StartHangingFromCeiling
- Start hanging from ceiling.
- DropFromCeiling
- Drop if hanging from ceiling.
BaseNPC inputs
CAI_BaseNPC:
- ActivateSpeedModifier !FGD
- DisableSpeedModifier !FGD
- Break
- Smash into pieces. If this is not possible, disappear.
- BecomeRagdoll (in all games since )
- Remove itself and instantly become a ragdoll with zero force (just go limp). OnDeath, etc. outputs will NOT be fired.
- ForceInteractionWithNPC <string> <string> (in all games since )
- Force the NPC to use a dynamic interaction with another NPC. Syntax is <targetname> <dynamic interaction>.
- ForgetEntity <targetname>
- Clears out the NPC's knowledge of a named entity.
- UpdateEnemyMemory (in all games since )
- Update (or create) this NPC's memory of of the given entity.
- GagEnable
- GagDisable
- Gagged NPCs won't speak (or moan, caw, etc.) unless made to be a choreographed scene.
- HolsterWeapon (in all games since )
- UnholsterWeapon (in all games since )
- Force the NPC to holster or unholster their weapon. Ignored if the NPC is scripting or if the NPC doesn't use weapons.
- HolsterAndDestroyWeapon (in all games since )
- Same as
HolsterWeapon, except the weapon is destroyed once it has been concealed.
- IgnoreDangerSounds <float>
- Ignore danger sounds for the specified number of seconds.
- InsideTransition !FGD
- OutsideTransition !FGD
- SetBodyGroup <integer>
- HACK: Sets this NPC's body group (from 0–n).
- SetEnemyFilter <string>
- SetHealth <integer>
- Set the NPC's health.
- SetMaxLookDistance <float> (only in
) - Sets the maximum look distance for the NPC. Defaults are 2048 and 6000 for long range NPCs.
- SetRelationship <string|targetname or classname> <string|disposition> <int|rank>
- Changes whether this NPC likes or dislikes certain others. Used like the ai_relationship entity, with this NPC as the subject.
- Values for
dispositionare:D_HT: HateD_FR: FearD_LI: LikeD_NU: Neutral
- SetSquad <string>
- Change the name of this NPC's squad. Leaving the parameter blank will remove the NPC from any existing squad.
- StartScripting
- StopScripting
- Enter/exit scripting state, where NPCs ignore a variety of stimulus that would make them break out of their scripts. They ignore danger sounds, ignore +Use, don't idle speak or respond to other NPCs' idle speech, and so on.
- Wake
- Wakes up the NPC if it is sleeping.
CBaseCombatCharacter:
- KilledNPC !FGD
- Tells the entity it killed something. Despite the name, this can include a player. This input will be automatically sent by the victim when they die.
- physdamagescale <float>
- Scales damage energy when this character is hit by a physics object. With a value of 0 the NPC will take no damage from physics.
DamageFilter:
Outputs
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Dedicated Console Variables
| Cvar/Command | Parameters or default value | Descriptor | Effect |
|---|---|---|---|
| sk_headcrab_poison_health | int | A poison headcrab's spawn health. | |
| sk_headcrab_poison_npc_damage | float | A poison headcrab's damage scale. Doesn't work. |
See also
Categories:
- CBaseAnimating
- Non-internal Half-Life 2 entities
- Half-Life 2 entities
- Half-Life 2 point entities
- Non-internal Half-Life 2: Episode One entities
- Half-Life 2: Episode One entities
- Half-Life 2: Episode One point entities
- Non-internal Half-Life 2: Episode Two entities
- Half-Life 2: Episode Two entities
- Half-Life 2: Episode Two point entities
- Non-internal Half-Life 2: Deathmatch entities
- Half-Life 2: Deathmatch entities
- Half-Life 2: Deathmatch point entities
- Non-internal Black Mesa entities
- Black Mesa entities
- Black Mesa point entities
- NPC entities
- Pages with uncategorized bugs
- Half-Life 2 NPCs
- Headcrabs