Xensahu

The Xensahu are a species of hyper-intelligent, worm-like parasites covered in an exoskeleton. They originate from the planet Arkona. They are rarely seen without being attached to a host, most commonly the Nesallon, creating the species "Kryavox".

Biology
The Xensahu have several tendrils lining the bottom of their body, which they use to pierce the skull of hosts and take over their nervous system. When attached to a host, they will control its actions and biological activity, with the ability to change the body as they wish. Often, this takes form in skeletal extrusions from the body of the host, such as the skeletal arms coming from the body of the Kryavox.