Your Point Of View:

You are a soldier in the UAAF (United Aerospace Armed Forces) assigned to the secondary military research base on the darkside of the giant moon Tei Tenga it was nicknamed "The Butt End of Space". You and four friends are having a game of cards in the hangar bay. One of your friends leaves to go on shift.
Meanwhile, the research team are doing experiments at the anomalies found on the moon. There is a flash of horrible light and energy and two gates open at equidistant points on the moon's surface, the larger of the two at the lightside. Every awake is quickly killed. One reaching for the alarm button has his hand chopped off. Briefly your friend is grabbed, his cap falling off in the lab. Then they spread out through the airducts and possessing sleeping people with magic.
A short while later, a strange alien creature bursts into the room."What the hell?" A fight ensures. Whoever's left in your squad investigates the base, where a dark tale begins to unfold. A bunch of small hostile alien creatures have invaded the base. Strange symbols are drawn everywhere in the blood of dead soldiers and scientists. The more you go forward, the stranger and grosser the walls become. On your way, you find your friend's cap.
After you make it to the control lab. You also find a gate to another place in the wreckage of what was a containment chamber. One the other side, you find two huge beasts in a circular natural rock canyon and the remains of the lab team. Between the beasts is your friend and they corner him. You defeat the beasts, turn to leave, only to find the hole closing! You're trapped here! You climb the rock walls, and look at your surroundings from the top of this extinct volcano: "Oh, hell..."