Klume

Physiology:
Rakka are tall, reptilian humanoids from a world other than Earth. They are violent in nature, often taking no sympathy in killing a living being, which are often members of the human race. People are often mutilated and then burned, while rakka cheer on for their victory.

It is hard to point out, but they do have eyes, very many in fact. About 9 on each side shine a inky black color. 4 arms are their main 'manipulators', for handling tools and weapons.

The most notable facts are their mind control ability and telekinetic ability. Looking at them gives them the opportunity to take control of ones mental state. Their telekinetic 'gift' is likely their advanced technology, acting upon their command.

Speech:
Rakka are capable of speech, but in their own language. Most vocalization heard from them are grunts and roars, or cries for help. One quote of them speaking reads:

"It carriesss explosivesss."

It was referring to a human survivor, who had strapped bombs to herself in hope of killing the two soldiers. The woman and soldiers both died in the explosion.

The Extermination:
Rakka forces started their extermination of the human race in Houston, Texas in the year 2019. They still occupy Earth with an scaly fist, enslaving humanity and slowly driving them to extinction. They invaded through a series of waves, taking down buildings using their rivaling technology.

Survivors were taken to a breeding facility for Rakka young, some who were defective from the breeding, say "It's worse than hell." Humans are treated as pests, like rats in the sewers and insects biting your skin. Humans were experimented on in various ways. Mental capability was augmented, giving the Rakka complete control over a persons mind. People who are 'augmented' are then walked through cities, claiming,"They have built paradise, a sanctuary!." They will repeat this a number of times, hoping everyone will listen, and join them.

They built mega structures in the center of major cities, holding facilities for different functions. They raised global temperature, rendering the air nearly un-breathable. The mega structures did so by spewing methane from vents, leaking into the atmosphere.

Humanities Enslavement:
Survivors were often taken to structures by ground or by flight. They build structures from the Rakka, fix machinery, and are experimented on, often leading to their demise. Large vehicles patrol areas, looking for survivors to be placed into slavery or into breeding.

Technology:
Rakka technology depends on a fluid-like substance that renders the technology usable. These black fluids appear on cybernetic appendages attached to experiments, on vehicles, suits, guns, tools, interior, and architecture. The liquid was used in their invasion of Earth to level cities, likely to build Rakka infrastructure. Almost everything appears a black color, even the Rakkas physical body.

On their protective suits appear a small dome, protecting their head from the vacuum of space or by harm from human resistance members.

Architecture:
As said before, large structures were built in Texas, the biggest located in Houston. From vents surrounding the main structures spew methane. Smaller structures surrounding the Houston megastructure can be seen guarding it. These buildings are miles high, puncturing the clouds.