Unidentified droid shapeshifter species

Spotted mainly in the Outer Rim throughout much of galactic history, an unidentified sentient droid shapeshifter species lurked among the known fringes of space. They were a nomadic species, and some reports indicated that some specimens dwarfed even skyscrapers. Not much was known about them, their motives, or why they moved among the stars and never settled, other than that they could assume a variety of forms--weapons of war, buildings, synthetic replicas of humans, and even simple household items--and that, according to some accounts, the species was engaged in a catastrophic civil war on what appeared to be their mobile, living homeworld.

Behind the scenes
The species is a possible reference to or even the Cybertronian species itself from the Transformers franchise.