Project Nemesis is a fan driven website for games that use the One-Roll Engine (like Nemesis, Wild Talents, Reign and Monsters) or Chaosium's Basic Roleplay System (BRP) (like Call of Cthulhu) and the Delta Green setting.
"While you quickly scan for an escape route, one of the creatures
reveals a strange fat cylinder. The creature twists off one end of the
cylinder exposing a set of dark pustulated lips within. As you try to
dive out of the way, a huge glob of slime suddenly bursts forth from
that awful pair of lips. The glob hits you straight on and you find
yourself engulfed by the sticky slime and pinned against a wall. You
struggle vainly to escape and just as the slime invades your nose and
your mouth and you begin to pass out, you see a dark form swim past,
inside the ooze."
Artifact #1: Womb-cylinders
Built by the Mi-Go with the benefit of some knowledge bestowed unto them by Shub-Niggurath, the womb-cylinder is the birth chamber of a nasty burrowing parasite. The resourceful Mi-Go used this cylinder, its occupant and the ooze in which the occupant resides as a heavy-duty weapon for defending themselves against flying Mythos enemies. Now that humans have developed such military devices as full-automatic weapons, helicopters and planes, the Mi-Go occasionally employ this weapon against people, when the shit hits the fan.
Possibilities:
increased nastiness: the ooze is acidic, is toxic, is flammable, ignites on contact with air, or is protomatter
decreased lethality: the cylinder only fires if it detects movement against its field of vision. Of course, standing perfectly still when surrounded by the horrors of the Mythos is pretty tough. Someone might be able to make it discharge before it gets pointed at them though, by tossing something through its field of vision.
Artifact #2: Cloud-Seed flares
"The operatives encounter a group of Greys in an open field. Before the operatives get a chance to react, one of the Greys points a slick metallic pistol-shaped object at the sky above. The tool makes a sudden scraping noise and a stange twinkling mote of light soars up into the clouds above the operatives' heads. The operatives hear a deep rumble and then orange rain begins to fall."
Possibilities: (You could even colour-code the rain for different effects.)
the rain is a very strong hallucinogen, the investigators are soon flat on the ground having some very bad trips. Suggestions for hallucinations: they see it rain airplane fuselage and human body parts or more surreally, they see it rain disembowelled cats and disembowelled dogs
the rain is a strong sleep-inducing drug
the rain is human blood, pure and simple, the Greys use it to distract and intimidate; Sanity rolls everyone.
the rain is acidic, flammable, toxic, protomatter, etc. (but I like this artifact because it can be disturbing, while non-lethal)
The Mi-Go sometimes equip their little puppet-minions with cloud-seed flares so that they can deal with unexpected encounters of the human kind. The flares themselves are based on some highly advanced and unstable synthesized biochemical catalysts.
Artifact #3: Hemato-Vision goggles
Last seen on some NRO DELTA or BLUE FLY operatives, these goggles are one of the tidbits of technology the Mi-Go have been using as a carrot for MJ-12. The goggles themselves are multi-faceted and vaguely organic in design, giving the wearer an odd insect-like appearance. For the wearer of these goggles, all human blood glows a surreal purple. This glow can be detected whether the blood is currently in a person's veins, or 20 years old and caked into the carpet, or sloshing around in a critter's belly. The goggles are useful for hunting people or people-eaters and as a very quick-and-dirty forensic tool.
Notes: Apply Sanity rolls as much as you like for finding blood where it should not be and simply for prolonged use of these creepy things. Also, you might want to make these goggles secretly feed upon the wearer, gradually rendering them anemic.
Although they are currently unable to explain the workings of the goggles, project PLUTO scientists are convinced that the answer lies within the Cookbook. They are mistaken.
Built by the Mi-Go with the benefit of some knowledge bestowed unto them by Shub-Niggurath, the womb-cylinder is the birth chamber of a nasty burrowing parasite. The resourceful Mi-Go used this cylinder, its occupant and the ooze in which the occupant resides as a heavy-duty weapon for defending themselves against flying Mythos enemies. Now that humans have developed such military devices as full-automatic weapons, helicopters and planes, the Mi-Go occasionally employ this weapon against people, when the shit hits the fan.