Eons ago, our ancestors looked up to the stars and wondered if we were alone in the universe.

Now, we travel across those very same stars.

In the decades since the development of the atmosphere processor, the hypersleep chamber, the FTL Drive, and other miraculous advances, expansion to the rest of our solar system and beyond has gone far beyond whatever our ancestors could have expected. The factions and major powers of the old world have had to reorganize or die to keep up with both the rewards and dangers of expansion into outer space. New factions have risen on colonies and fleets far beyond the influence of our homeworld.

There are problems beyond the usual infighting between species and empires that has plagued our world for eons. Making sure that things as basic as life support and lights stay on is a constant struggle on the harsher colonies, especially the shake and bakes that have yet to be fully terraformed. Making sure that changes in gravity and atmosphere don't pop a colony ship full of people into paste before they make it to a viable world. Dozens if not hundreds of little things that can (and have) gone wrong on the Frontier.

However, a new problem has begun to arise. New and old colonies have reported finding "anomalies" during underground excavations and expeditions beyond settlement walls before suddenly going dark. Sometimes transmission channels remain open long enough to sporadically broadcast screams and sounds of battle before completely ceasing. Sometimes a young colony that is just getting set up goes dark without any apparent explanation.

This is happening more and more.

Long ago, our ancestors looked to the stars and wondered if we were alone in the universe.

Some had hope of befriending creatures from strange new worlds. To make contact with advanced, flourishing civilizations. Or at the very least that there would be unique wildlife to observe from a distance.

We know better now.

There is life beyond our world.

We would have been better off if there wasn't.

Internecivus raptus. Plagiarus praepotens.

Xenomorph XX121.

One of the most common and dangerous examples of alien life in the Frontier. Eyeless parasitoids that use the warm bodies of other creatures as hosts for their young in their now infamous reproductive process. A lifecycle with a great variety of forms, and there is little doubt that there are more stages that we have yet to witness. Despite not being native to our world and vice versa, they have had no difficulty growing their young in victims from a wide range of origins, be it Terran or some long dead civilization that has only left mummified fossils and derelict structures behind.

They are not your typical alien invader portrayed in the science fiction of yesteryear. They will not come to the skies of your world in a flying saucer. They will not drop bombs from orbit or zap you with a ray gun.

No, what makes them dangerous is not that they will come to you. It is that, without knowing it, you have already come to them. In unexplored caverns, mountains, abandoned cities, derelict spacecraft, and even the depths of the seas, there could be a massive nest of eggs, or worse, adult xenomorphs and their queen in hibernation, waiting for warm bodies to come along and wake them up.

Perhaps they might be the reason why a world selected for terraforming is so barren. Perhaps they harvested every living thing on the surface and went into hibernation when they ran out of hosts and food. At least until you came along. And now there is a nest deep underground or hidden in a cave system, ready to be awoken.

In the depths of space, abandoned ships and other structures might hold a hive that killed the original crew and is now waiting for more victims in an environment without artificial gravity or lighting, where you need oxygen, and they don't. They have even been found clinging to meteorites, much to the surprise of several deep space mining crews.

Despite the danger posed by the xenomorphs, expansion into the Frontier persists. From individuals looking to start a new life or to escape from a bad situation to large corporations and governments looking for profit and power in the depths of space, there are still large amounts of people braving the final frontier far away from an overpopulated and increasingly divided Terra. There are those who hope to gain something from researching the creatures up close, regardless of the horrific costs.

The basics of the xenomorph lifecycle and its interactions with the most common species on Terra, humanity, are becoming known on a wider scale after the Slaughter of Remina and the Surge turned the aliens from an urban legend into a very real threat known from colony to colony all the way back to Terra despite efforts to hide the truth by the Coalition and other interstellar powers.

Guides, novels, and vids detailing the nature of aliens and how to avoid delay certain death have already been published in exhaustive detail for those who can afford them.

The purpose of this compendium is instead to detail interactions between the xenomorphs and the mamono, the most varied collection of races on Terra. Ironically their highly adaptable DNA and reliance on other species to reproduce makes them quite similar to the xenomorphs in some ways, but I wouldn't recommend saying it to one's face even if she's an imp or a little fairy. Hell hath no Fury especially in a bar filled with veterans of the Surge.

Here is the template that will be used:

Species Name:

Interactions:

Biological Compatibility With Xenomorph:

Potential Uses Against Xenomorph:

Similar efforts to this compendium are being made to detail the threat of the Xenomorph when given access to such a diverse and genetically malleable source of prey. Multi-species military organizations such as the Anti-Xenomorph Combat Unit (AXCU) are currently forming to deal with the ongoing threat of XX121 and potentially other alien threats. It is my hope that this compendium might help not just soldiers, but average civilians looking for some peace of mind or to quench their curiosity in regard to a species many are still just starting to learn about, quite like the monster girl encyclopedias of old.

Without further ado, let us begin.

And don't let the bedbug's bite.