DROPFLEET BIOFICERS

Welcome to the Bioficers, ancient artificial intelligences who have outlasted their creators. Their only purpose, now, is to find worthy opponents and enjoy their suffering as that prey is hunted to extinction. A quote from the PHR Commander Aurelia Felix most succinctly describes them:

The Sphere surmises they were weapons that outlasted their masters. They are code, but individuals. Each sentience was generated eons ago, cannot be replicated, and is beyond our comprehension. Some are quite limited, like those that pilot their vehicles, others are towering intellects. Each exists in a distinct, physical space, but can be transferred, like when a ship or vehicle is destroyed. Each transfer introduces data corruption. Simply, they become less capable and less sane each time. They were built to enjoy war. By now, they are twisted things. 

They are master fleshbuilders. They cannot synthesize complex, sentient, or lasting structures, but biology is their clay. They can vaporize it, ingest it, and shape it. The drones you have fought can be woven in minutes and are disposable. Their bioforms are built for specific tasks, as needed, and might be any shape your nightmares can conjure. 

Their technology is apparently painstaking to build, and their spacefaring is glacial—we suspect foldspace jumps degrade their code. Losses will slow them, but they are in no rush. They have no grand strategy. Time is irrelevant to them. They want us to resist, and we have no choice but to. We are their playthings until they annihilate us. That may take years, decades, or lifetimes.