Speaking of broad strokes I already have a lot written on them since their kind is somewhat of a import, but they're flexible enough to re-contextualize since I figure that the psychotic trans-humanist movement may have caused a disruption that provoked their migration or something of that nature.

Thematically the beings I have in mind are meant to be more of a nightmarish thing generally loathed by other societies, like a swarm of giant sadistic space wasps.  I'd rather all the aliens be unique from humans in some fundamental way (though I failed to enforce this even in my own NRP attempts that took off, it would probably surprise me to see a NRP with player created alien species where none of the aliens ever hit a human-likeness greater than say, the Shanghelli from Halo).  It's almost as if people don't wanna be weird squid things.

Anyhow, in terms of what societies these beings have I have a several as they're immigrants from a personal setting.  I give most of my major aliens multiple civilizations and the Vopson are no exception.  I omitted two of them since one of them is too contextual (being reliant on the existence of a spacefaring Titanian sapient) and the other is too advanced.  Of the two left, the Pale Swarm lacks much in terms of culture and are too insular while the Golden Swarm is more outward looking and more materialistic and so I deem the more interesting of the two.

[hider=The Golden Swarm]

The Golden Swarm is a extremely opulent swarm.  The Golden Swarm unlike the Pale Swarm is much, much more aggressive in its behavior and more affable, in that it is possible to communicate with them.  The problem being that the Golden Swarm's flocks tend to be extremely sadistic and view humans and other individualistic species as sub-sapients, but hive minds and other flock intelligences they seem to treat with some greater degree of respect should they come across them.  The Golden Swarm's culture is much more materialistic as they love to horde gold and flesh (along with skins, skin makes nice wallpaper).  The Golden Swarm also tends to enslave whoever surrenders to them in a tribute system where in exchange for protection from the Vopson you are taxed at about 5% of your population every collection cycle (which is a several years).  Highly populated worlds are seen as valuable since the Vopson noticed sub-sapient beings tend to have much larger populations of megafauna (humans count as a megafauna- the Vopson are small compared to us) than animals do (while the Vopson have even more!), and so tend to want control of highly populated planets, though they settle for outer colonies as well.  The slaves are not used for practical purposes whatsoever.  Let us leave it at that for now, the shock factor is spoiled if I tell you now.

The Golden Swarm's technology is centered around large asteroid spacecraft that act as the main unit which a lot of their infrastructure is based around- these asteroid spaceships are essentially like mobile and oozing, bloody O'Neill Cylinders in sci-fi terms.  The Golden Swarm has technologically developed a mastery in all matter of corrosives and the general motif of their tech tends to be acidic.  Lots of colorful and eroded aesthetics all around thanks to their fetishism of molten sulfur they like to have bubbling about.  Molten Sulfur for reference is the reason why Io is so colorful.  A world like Io the Golden Swarm would covet due to supplying them with the large quantities of sulfur needed for all the sulfuric acid they like using in their weaponry and mold casting.  

[/hider]

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That being said if there's too many people making "outside" alien forces i'll make a UA member instead.