Ghost People

Ghost people (also called locals by Dean Domino) are creatures found in the Sierra Madre

Background
Ghost people are mutated humans changed forever by the Cloud, a combination of corrosive rust-like toxins unique to the Sierra Madre. A green vapor that seems to be a by-product of the Cloud escapes and is reabsorbed continuously from their hazmat suits by means of aeration on their thighs, elbows and face mask, indicating that their mutation originates from permanent exposure to the Cloud. They are the only ones able to walk in and out of the Cloud unharmed.

The ghost people originate from construction workers that worked on the Sierra Madre Villa before the war. During construction, a strange gas that would evolve into the Cloud began leaking from the pipes and hospitalized a worker with severe lung and tissue damage; further progress was called off until protective gear could be issued. Hazmat suits designed specially in Big MT arrived to protect against the noxious gas. Incidentally, the gas leak itself was also created at Big MT, and with the hazmat suits being an "experiment within an experiment." The hazmat suits were bulky, nearly impossible to speak through and grew stiff with use. The locking mechanisms would quickly corrode when in contact with the Cloud, to the point where the hazmat suit had to be cut open with a cosmic knife, yet the suits still did not provide proper protection from the poisonous gas cloud.

Ghost people are similar to feral ghouls in several aspects. Dismembering them reveals bright, glowing blood, akin to that of a glowing one and they also shriek before attacking. However, they seem to be a different mutated evolution and not simply a feral ghoul or glowing one in appearance, as their ability to use and construct weapons is still intact. Virtual immortality and death only with limb amputation is also a mutation very specific to them.

The moniker "ghost people" can also be ascribed to the ghostly manner in which they inhabit the ruins. Their manner, movements, and general presence are seemingly much akin to a malignant haunting to any who have survived and fled attempts to breach the Sierra Madre. Dean Domino questions whether being "alive" applies to the ghost people, and claims there are hordes of ghost people living under the Sierra Madre's streets, comparing it to a hornet's nest.

Biology
Ghost people are mysterious creatures. They do not speak and never sleep. They seemingly exist only to lurk through the villa ruins, forever seeking prey. If they have a lair at all, it is unclear where. According to Dean Domino, they collect anywhere in the Sierra Madre away from holograms and the underground service routes and ruined buildings of the Sierra Madre Villa are prime habitats for them. Their most common hunting grounds are Salida and Puesta del Sol, especially in areas thick with the Cloud.

The centuries-old stiffening hazmat suits and Cloud-related malady force them to shamble like undead creatures. Despite this, they are in fact quite agile when necessary, often lunging and dashing at high speed. The ghost people are incredibly territorial and equally hostile and oust any intruder from the Sierra Madre. Their primitive minds still form some semblance of group tactics as they hunt their prey similarly to a pack of wolves. They band together in groups of two to three and hide in the refuges of shadow and Cloud, striking relentlessly when prey wander too close.

Like ghouls and super mutants, ghost people are functionally immortal, however, they can die if their limbs are dismembered. Blood and yellow fluid spray at high pressures when they are injured, which Dog explains as them having pockets of pressurized gas inside them.

Gameplay attributes
All ghost people are hostile to the Courier. They are difficult to pin down, as they will constantly lurch and jump around during engagements. They also actively avoid a rifleman's aim, particularly near their head. They do not utilize firearms, using only primitive weapons made from resources found in the Sierra Madre villa. Ghost people also do not take extra damage from headshots. This is somewhat balanced by their complete lack of functioning armor.

They are difficult to kill permanently by normal means. They must be disintegrated, dismembered, or eaten by Dog, or they will simply get up and continue attacking. The simplest way to keep them from getting back up is to cripple or dismember their limbs with a melee weapon (like a cosmic knife,) an explosive (like a demolition charge,) or from concentrated ranged attacks to a single limb. The loss of a limb will always kill the ghost person. If a ghost person is already down, attack with a melee weapon or target their limbs with a ranged weapon until a limb is removed to stop them from reviving.

Crippling a limb while a ghost person is conscious will dismember the limb, killing them even if the crippling attack does not reduce their health to 0. The Bloody Mess perk helps considerably with this task since it increases the chance of dismemberment with standard firearms. The revival of the ghost people is indicated by characteristic gurgling, so it is recommended to either stand back or quickly destroy one of their limbs before they wake up.

However, after a certain dialogue path with Dog starting with the phrase "I watched you devour one of the ghost people," Dog will give the Courier the Ghost Hunter perk, allowing one to kill ghost people without Dog or chopping off their limbs.

Often the only warning of their presence is a strangled choking or muttering sound they make. Ghost people should be exceedingly easy to sneak by, as they have zero Perception, however many players will have trouble with this from time to time; the reason for this is that New Vegas' sneak calculations always account for daylight, even though Dead Money's weather does not visibly have any. Sneaking during the day accounts for a penalty equivalent to 100 points of sneak, and therefore a player who is not watching the clock will find them impossible even with maximum sneak if they attempt during daylight hours. The solution is to wait in a corner until 8 PM or so and continue sneaking then.

Variants
Each variant of ghost people has six levels of difficulty. Each level has identical statistics except for level and health.

Ghost harvester
Ghost harvesters are the most common variant of ghost people. They are the smallest variant and are easily distinguished by their hoods and smaller gas masks. They are equipped with knife spears and throwing knife spears, using the throwing spears until they are exhausted and then charging the target equipped with a knife spear unless the prey closes to melee range first.

They are not the most durable or proficient opponent in close combat, but their throwing knife spears can cause great damage in a short time. Also, they usually perform a jump to the right or left after throwing a spear, which makes them hard to target with a firearm outside of V.A.T.S. During one section of Fires in the Sky, ghost harvester corpses will contain ghost harvester remains for Dog to eat.

Ghost trapper
Ghost trappers can be identified by their large size and lack of hoods. They are only equipped with bear trap fists. Ghost trappers are also responsible for the inordinate amount of bear traps and trip wires in the Sierra Madre. They are capable and tough unarmed fighters, so they are best picked off from a distance. However, ghost trappers are often found in groups with knife spear-bearing harvesters or seekers.

Ghost seeker
Ghost seekers are the least common variant of ghost people. They are taller than ghost harvesters but slimmer than ghost trappers and wear a hood. They are equipped with knife spears and gas bombs, throwing one or two gas bombs and then closing to attack with a knife spear. While they do not withstand as much damage as ghost trappers, ghost seekers are extremely capable in melee combat. The gas bombs that seekers throw can cripple limbs.

Appearances
Ghost people appear only in the Fallout: New Vegas add-on Dead Money. The origin of the ghost people suits is further hinted in the add-on Old World Blues.

Sounds

 * Ghost people breathe loop