"Sivver is the common name given to crystalline parasites, which interact with the nervous systems of carbon based Chordate life forms."

Definition of the word Sivver provided by the Galactic Scouting Guild's Almanac

“The Sivvers are an alien weapon that turns people into murderous glass sweating zombies.”

Uwell Ofmobile, retired Galactic Scout  

Silent and invisible, the only herald of the arrival of Kayrun the Disintegrator is the screams of his victims. 

Quest

With one of the most bizarre anatomies recorded the keerg are strange indeed. And that’s not mentioning the thirteen tentacles.

Of all the threats space travelers may face, few are as difficult to predict as Gamma Goblins.

The Stargate universe has revealed to humanity many of its secrets, and left more open. One of the most persistent mysteries stay the Furlings.

God of Strength in the Night, Hiding your Numbers, and The Silent Kill.

Codex

Captain, I see two dozen general displacement ships just coming into sensor range outside the system.  There is no warp signature sir.

How Odd. Helmsman lay in an intercept course and let us investigate.

"Some creatures are simply hard to talk with. Take the Krys for example…"

Egads! Don’t you humans understand how freaking repulsive you look? I’m getting sick to my stomachs right now… urp…

Nempori Diplomat Ocan

Gene-engineered for deep-space, the Salvorathan resemble nothing quite so much as the legendary ‘dwarf’.

Codex

This vast and ancient organism played an important part in the mysterious organization of the cosmos, facilitating the isolated development of inteligent species.