A Sarkeen is one of the two main types of Cleax. They were crucial in the Battle of the Sarkeen.
We do not know what the Sarkeen are. We don't know if they rule the Cleax, as some have speculated. We don't know if they are even the same race as the Cleax, though it is believed they are, and they are typically referred to as such. Do the Sarkeen begin as a normal Cleax, and evolve? Were the Sarkeen intentionally mutated by the Cleax? Are they nothing but extreme genetic outliers among their race? We don't know.
What we do know, and what was discovered during this Third Invasion, is that they are the greatest weapon the Cleax possess. Though apparently few in number, the Sarkeen are enormously powerful, each acting as effectively huge, living starships with a crew of one.
A Sarkeen looks like an absolutely massive, mutated normal Cleax, with a gaping maw, multiple long tentacles that look like mutations of the many ‘arms’ of a normal Cleax, and long tentacles. Although we've never captured one, they appear to move via some kind of internal plasma railgun system. They generate plasma, somehow, and then shoot it out of orifices on their body at incredibly high speed, though using what mechanism, we don't know, propelling them forward. They're similarly able to deal immense damage by firing near-steady streams of plasma at opposing starships through their multiple tentacles, each of which is centrally controlled by the Sarkeen's single brain, and which act together with perfect coordination.
The Sarkeen protect themselves in a variety of ways - they can generate powerful bio-electric fields that act as shields and that is widely believed to be a product of their own flavor of star kith, they can release swarms of incredibly destructive clouds of 'spores' that attach themselves to any metal object and quickly begin reducing it to component atoms, and they're able to generate singularly powerful EMP (electro-magnetic pulse) bursts to disable nearby ships or drones.
