Eitak

Eitaks are ugly organisms that operate as the main guards within the alien headquarters and within areas "terraformed" by the invasion. They are well armed due to the fact that they guard such important areas and therefore are perfectly capable of dealing out quite a bit of damage, especially as one would expect when encountered in numbers. They utilize likely-natural armor strong enough to shrug off a few rounds, but sustained fire will kill them easily. It is not advisable to do battle with Eitaks in enclosed spaces as they are good shots and others of their kind will generally pour into the area to aid their brethren, making them that much more difficult to defeat. It is advised however to use a quick powerful weapon to dispense with them as quickly as possible.