Acid Blood: see special rules (roll grenade scatter for splatter - Damage 6D)
Atmosphere Independent: The Adult Alien can survive underwater, or in space without danger of suffocation for an unknown period of time.
Bite: Str+2D Damage
Invisible to Infrared: The creatures are undetectable through the use of infrared vision or similar scanning devices.
Natural Camouflage: The creatures adapt their coloration to their environment, and they blend well into both organic and constructed environments. +2D to hide skill in most conditions as long as the creature remains still.
Pheromone Communication: Communicates primitively through the use of pheromones. These pheromones can be used to indicate the location of potential prey or hosts, emotional state, developmental stage, and hive affiliation.
Radar Sense: They can "see" through a form of ultrasonic echolocation that allows them to perceive shape and movement. No penalties for darkness or smoke.
"It's got a wonderful defense mechanism: you don't dare kill it." -Parker (from Alien)
The title "Chestburster" comes from the fact that this organism's first action is to violently tear its way out of the victim's upper abdominal cavity, or where ever it has migrated to in the hosts body. The Chestburster is the final stage of a full-grown Embryo.
Once it has broken out of the host's body it is ready to begin its final growth period into an Adult Alien or Alien Queen. Data available on Chestbursters suggest that it requires no sustenance whatsoever to grow into an adult from this stage. This may not be accurate, because there are occasions where an Adult Alien will kill what would otherwise be a potential host, either in defense of territory or as a source of food. The Chestburster phase may take on whatever sustenance it can find, as a scavenger. The chestburster will avoid contact during this growth period, as a natural instinct to avoid predators.
A Chestburster is initially about 18 inches to 2 feet in length, and usually possesses only a head, forearms, and a long tail on which it slithers like a serpent. This may vary based on the genetic materials of the host. Like the Embryo, this phase of growth is also very short, since the Chestburster matures to adult size in 12 to 24 hours. The creature sheds its skin periodically during the growth period.