Harvester (Skyline)

Overview
They are black-celophapod creatures with the ability to entrance different species.

Species
there are four types that are known here:

Drones are squid-octopus like aliens with multiple eyes and glowing lights on there tentacles

and can entrance species and can take tere brain and spinal cord for energy, and are a slimy black color.

Tanker are giant crab-frog like creatures with multiple eyes and 8 brains for "power" instead of entrancing them with blue lights the have spiny tentacles that can grab host,they walk/run on four legs and are olive green in color.they are incredibly stong but there skin is flamable.

Arerial drones are flying aliens that are basically dropships that patrol and release dones to find host.they are black with some wings and have one Big blue eye,have no power to entrance a host, and are Kamikazies or "suicide Bombers" when encountering Aircraft.

'''Worker/guard/soilder? '''are graudripeds that look like a smaller tanker.And have a watermelon-like head with multiple blue eyes and have a slimy black color like the drones and need one brain to power it up.

Abilities and anatomy
They have the ablity to entrance a host and feed/power up by "brains" .have a blakish-purple blood.They use a bright blue light to entrance creatures and suck them in there body by wholes or mouth-like things only the Drones have the  power to entrance.This probably a evolutionary trait or somthing that they developed.They have Alot of Stem cells or somthing totally different because there tentacles can regenerate to there body.

Technology
There technology is a fusion of metellic metals with some organic properties and there machines can rebuild themselves even after a nuclear strike!(it might be destroyed if if gets hit in the inside.)

heres a list of machines:

There ships are made with a metal hull and organic substances on the inside, a gravity lift ,and the power to entrance.And look saucer-like in general,but with spirals and arches sticking out.

There lights are bright blue Teleporters that can suck Humans into thin air, possible desends from the ships?

Alien sorter is a thin machine with a blue light on the front with a 3-pronged claw,a razor blade, and a tube that sucks up the brains into an a room that attaches it to the aliens.

Althought they do not have any type of small arms or ship firing guns(with the exception of the Arerial Drone as its a "living missle")they are pretty advanced.