The Q-Viruses were an ancient hostile species of unknown origins that first appeared from a meteor that fell into Mater'Ciela 700 years ago.
Pyrixodatums are probably the most greatest threat of all Q-Viruses. They can attack with ferocity, wiping out a group in a matter of seconds if given the chance to do so. They also can camouflage themselves to obtain advantages of surprise attacks and ambushes. Their threat level is moderately high, but in a swarm, they are dangerous, and should be avoided.
Tongures, --derived from the word tongue, --are probably one of the most bizarre and unusual Q-Viruses due to their tongue-like appearances. They have no form of attack, and are used as fake targets.
TX21s are considered the drones or workers of the Q-Viruses. Having the appearance of a transparent white-blue spider with a yellow nucleus and 8 skinny legs, they can prove a large nuisance in a swarm.