[b]The Ccrypcp/Kyrpsp[/b]

Alien species of considerable advancement, the Kyrpsp are among the stranger aliens encountered by man, a composite of multiple species who together make a self-aware, intelligent life form.  A large parasitic hexapodal creature rides atop of a quadropod with a large, large hump.  There is that tubular creatures that can wrap themselves around the main body, acting as arms and legs for the Kyrpsyp.   

They are a species whose synthetic technologies derived from their overarching notice of composite forms, of which had lead to a vast array of strange, alien technologies that the Kyrpsyp have perfected over their seemingly ancient existence.  They are much more advanced than us, but they are far from unstoppable.

Their societies are distant, but they have colonial activity that is uncomfortably close to us, with visits from members of this strange kind being frequent.  They are not as social as people are, tending towards small groups who lord over a array of synthetic entities wherever they go, often reconfiguring their designs and regularly experimenting with new forms.

Exploration to their distant society has revealed them to be very advanced structurally, almost achieving parity wih the aveterriat- however their society is plagued by WMDs that they have taken endless efforts to contain.  They are always monitoring the far reaches of space to make sure their disaster hasn't spread to other parts of the galaxy...  And they are relentless whenever a outbreak is discovered, they initially make attempts to alert a world where the runaway WMD has gone to, cooperation being difficult as the risk of the WMD spreading to other worlds only increases with those who leave, a fact of which has led to multiple annihilation incidents should conventional extermination strike teams fail to contain the threat.  This WMD system is a sprawling bone complex that is cancer-like, slowly killing the world by spreading chlorine all over it, making the world uninhabitable over time.  When deliberately seeded, a thirty of them can wipe out a world in but a month.  The long delay of this WMD makes them a great force of leverage, but they are unpredictable as a seed can sometimes be spread to other parts of the galaxy, which happened in the five centuries war.  They are very clever weapons, being really a engineered super organism that digs itself into the ground and spreads by feeding off the sun and by using geothermal heat to grow while devouring native life for nutritional supplements.  

They are also active in other ways, they are fervent traders who have on multiple occasions forced a inhabited world into becoming a free trade world.

The Kyrpsyp have activity across a wide range of space, they lack any real political unity.  Only a long procession of mutual agreements (the purification agreement being the most well known)- they are a species that have suffered a devastating war that led to the spread of a WMD that after four centuries of war has only been scattered in the past five centuries of history.  Societies of their kind have come to power and have been comparatively outward looking despite the classical era where they maintained a powerful society for nearly a millennium before it simply rotted away into the devastations.  It should be noted that when they were a space faring society, humans were just running around stabbing each other with swords.

Make of that knowledge, what you will.

The Kyspsyp have a tendency to toy around, at the expense of other species.  Not too unlike the Rovii, but unlike the chaotic psyops the Rovii emply, the Kysrysp are far more calculating which makes them all the more difficult to contend with.  They have a sense of honor about them, a rarity in this galaxy, that has kept them from doing any officially sanctioned slave raids due to their system of government being very different from anything else in the galaxy.  They Kyspsyp are politically diverse and have experimented with Codominance based societies that in part for the greater good of all.  The Governing Web as they refer to it- a reverence for it akin to human reverence for democracy is common among the Kysrysp, who see the system as the reason for their achievements of culture, society and technology.  For they have no oppressive ruling class, instead they have a web of co-dominance all abide by.  This web of rulers is insanely confusing to outsiders, as it is within the web that one truly understands their place in society, with social flexibility that makes the web allow for one to pursue their dreams while still being accounted for.  It is essentially a system of watch men who watch the watchmen in a massive set of interlocking circles.  The society is far from equal, one should be warned.  This system only appeared after the collapse of the classical order, it should be noted. 

They apparently have associated with the Aveterriat in the past.

The rovii come from them, a former client species who got out of control who now go about in nomadic fleets after they tried to force the rovii back into submission.

There's three other "client" species who they exist with, with a tolerance of their existence for they are seen as part of the gestalt: the Marata (instirncual gun toting killer aliens), the Asantum (a sulfuric alien species who are used to colonize worlds uninhabitable to any other creature) and the Appartik, of whom are "cute" to the Kyrpsyp and pretty much seen as pets.  Arguably humans might seem them cute too.