The dome created an ecosystem of it's own, on part of alien terraforming techology.
Flashback of the attack
THE DOME
early exploration
an overgrown walkway leading to a pillar
inside THE DOME
the Aliens
Alien fetuses growing
The aliens are accustomed to zero-G environments, and are soft and fragile, so they developed metal skeletons to act as bodies and weapons at the same time. Here's an infested human.
Weaponry
The Alien weapons could be torn off from the defeated aliens and wielded by the player, thanks to an alien infection/interface in the nanosuit he wore. These are a sniper rifle (Cut through to show internal structure) and a gun with alternate fire modes. Gregor Kopka did the initial design on this.
