Inspired by the Xenomorph from the Alien franchise.
The Alien is an albino Xenomorph-like alien. It has a large white head like an Xenomorph, a spined torso and very sharp claws on both it's feet and hands. It also has a very long tail that ends in a long barbed spike. It uses its tail as a weapon, along with its claws.
It's ability is to increase it's damage output. This also makes your attacks implant an acid bomb into the survivor that was attacked, so they blow up after a set time, or after they are revived, damaging the survivor implanted, along with close by survivors. The Alien has thermal vision.