As part of the Yautja war they developed the Xenomorph species which have since spread throughout the galaxy. Xenos are often hunted by Yautja.
Species Name: Xenomorph
Physical Traits: When standing upright the Xenos are vaguely bipedal in form though they adopt a more hunched, quadrupedal stance when walking or sprinting. They have a skeletal, biomechanical appearance and are usually coloured in muted shades of black, blue or bronze. They do not radiate heat as their body heat matches the ambient temperature of the environment in which they are found. They have the ability of running and crawling along ceilings and walls, have great physical strength, capable of breaking through welded steel doors, and matching Yautja in single combat.
Xenos have segmented, blade-tipped tails. As a weapon the strength of the tail is very great having been shown to be strong enough to impale and lift a Yautja with seemingly little effort. They are also adept at using their tails as blunt weapons, sometimes to deadly effect.
They have elongated, cylindrical skulls but possess no visible eyes. How the creatures see is uncertain. Their inner jaws are powerful enough to smash through bone and metal.
Xeno blood is an extremely potent acid and is capable of corroding on contact almost any substance with alarming speed. It is dull yellowish-green in colour, and seems to be pressurized inside the body so that it spurts out when punctured. At least at the "facehugger" stage the acid is not blood but a fluid maintained under pressure between a double layer of skin. The Xenos are conscious of the effects of their acidic blood, and even use it to their advantage. They are immune to their own acidic and toxic liquids due to a endobiological build-up similar to the human stomach's ability to protect itself from its digestive fluids.
Xenos can produce a thick, strong resin that they use to build their hives and to cocoon their victims, and they can use the walls of their hives as camouflage. They also salivate profusely. The facehugger can "spit" acid, melting the faceplate of a helmet and allowing the creature immediate access to the inside. This ability is also exhibited by adults much like a spitting cobra, they use it to blind and immobilize their victims. With the exception of the "Newborn", Xenos have demonstrated little actual emotion, save for self preservation and maternal instincts toward their eggs. They make few vocalizations beyond snarls and high pitched shrieks when in pain or attacking. They regularly hiss while active, but are otherwise silent particularly when stalking prey.
Height: 15 ft
Weight: 260 lbs
Sensory Organs: Visual
Communication: Phermonal. The Queen may possess a rudimentry form of linked telepathy.
Reproduction: Their life cycle comprises several distinct stages: they begin their lives as an egg, which hatches a parasitic larval form known as a facehugger which then attaches itself to a living host by as its name suggests latching onto its face. The facehugger then impregnates the host with an embryo known as a chestburster which after a gestation period of several hours erupts violently from the host's chest resulting in the death of the host. The chestburster then matures to an adult phase within a few hours shedding its skin and replacing its cells with polarized silicon. Due to the transfer of DNA during the gestation period the alien also takes on some of the basic physical attributes of the host from which it was born.
INT: 2D6, WIS: 2D6, STR: 5D6, DEX: 4D6 +1, CON: 5D6, CHA: D6 -4, MR: 5D6, HPs: CON +D20
Orbit/Climate: 1 AU. Very stable, circular orbit, very stable surface temperature.
Atmosphere: Standard and corrosive Oxygen/Nitrogen with abundant toxic trace metals and gases.
Feeding Habits: Carnivore
Lifespan: 40 years
Culture: None, unlike many other recurring enemy extraterrestrial races in science fiction the Xenos are not an intelligent civilization but predatory creatures with no higher goals than the propagation of their species and the destruction of life that could pose a threat. Like wasps or termites they are eusocial with a single fertile queen breeding a caste of warriors. The aliens' biological life cycle in which their offspring are violently implanted inside living hosts before erupting from their chests is in many ways their signature aspect.
Government: Matriarch Caste
Population: 1.6 billion
Number of Stars: 2, Yaut Alpha and Beta
Star Type: K
Planetoid Belts: 4
Inner Planets: 2
Middle Planets: 4
Outer Planets: 1