Some OSSUARY concepts, still sketching and thinking!

https://www.youtube.com/watch?v=L-zwH3cbIg8

Of all the armed factions of OSSUARY, none are as equally feared and hated as the Vetala. Even their name is of dubious circumstance, a moniker thought to have been associated with the group, siphoned out of a comm network during one of their raids. They're thought to originate from the moon; sometimes dazzling blotches of light streak through the darkened skies and fog, though nothing is ever recovered from the supposed landing site - the Vetala make their presence known.

Communication log recordings are the only pieces of evidence that tell any information about them. Often, panicked shrieks are heard, stupefied that "the shots are coming from nowhere," or "they're not even in range." Others cry out about how they've detected IR signatures, but there's no reaction to confirmed hits. A particularly harrowing log details an account where an entire array of signatures presented themselves behind a guard's defensive line, and when they re-positioned themselves to face the threat, they were picked off from the opposite location.

Vehicles stand little chance; reports indicate that the Vetala are somehow both able to engage beyond the normal visual limits (even enhanced with visors) of Ossuary's fog-shrouded environment, but they are also able to cripple mechanized units, targeting vulnerable points with startling accuracy.

The Vetala's motives are unknown, and their attacks extremely rare, but nonetheless on unpredictable targets. Certainly personnel have been eliminated, important information taken, and on occasion entire outposts devastated - but no one certain entity is focused on.