Some alien creature designs suited for a FPS video game. Was done for Creature of the Week!
1-Sac-Burster: Incredible jumpers, they will use their suction like mouths to latch onto foes and their transparent sacs will burst covering their foe in necrotizing toxins. The individual is killed in the process but serve as a defensive mechanism for keeping intruders away from their colony. The toxins can cause a lot of damage but will be neutralized when introduced to water.
2-Arrowhead: Only a few inches long they can be found in shallow waters in large numbers ranging from about six to a few dozen. They are normally docile but can be quite aggressive when threatened. Their sharp bodies pierce into predators and sometimes will not exit until passing completely through their foe using their bony fins to wiggle their way through.
3-Pin-gliderCapable of gliding short distances, they use the spikes on their heads and wings to help stabalize their landing between trees. Unfortunately they tend to mistake other creatures as trees at times so it seems like they may be attacking but they merely made a poor judgment. Doesn't hurt any less though...
4-Trizard: Venomous Barbs extend in and out of it's back, for protection against larger predators. They also wield two large fangs on it's two appendage like upper mandibles. A Group of these small predators can easily take down an elephant sized creature with their venom. Extremely hostile, use caution if Trizards are spotted in the area.
5-Sand Scorpion: Watch where you step. These timid creature will often burrow in sand and dirt, leaving just their stingers exposed. Their tough carapace is capable of taking a lot of damage. However their vulnerable undersides as well as their slow movements, makes them easy pickings if they do not hide.