Xenomorph

Ancient Biological Weapons
The Xenomorph Plague was designed by the Ossians to be a biological weapon capable of infecting and destroying multiple species throughout the Galaxy, both intelligent and otherwise.

The earliest variant of a Xenomorph-like creation came in the form the Moglemorph - a small, disgusting, distructive creature that would manifest unexpectedly from a cute, disarming creature, referred to in it's pre-Moglemorph form as a "Mogwai."

Based on the success of the Moglemorph, the Ossians would go onto create the Xenomorph Plague, and eventually the subsequent weapon, the "Neomorph."