The Cthonian is a unique Phase 5 Strain creature.

Solcom scientific report:Edit

Phase 5 Exo-form – CthonianEdit

A massive conglomeration of evolved bio-mass combined with a powered armour carapace. The outer shell is a fully functional exoskeleton wrapped around a squid-like body composed of extremely resilient tissue. Capable of regenerating damage with dark matter conversion, this creature is nearly impossible to kill without the use of high output energy weapons. In addition to its defensive capabilities, the creature is armed with a gravitic beam weapon and a lethal nano-weapon capable of mutating a living target almost instantly.

In addition the Cthonian also seems to be able to exert the same empathic influence on infected subjects as the Grendlr.

At its core is a bio-organic computer, containing an amalgam of the Firebrand Cthon AI and ancient nano-spore techno-directives. Recovery of this system is of prime importance in understanding this outbreak.