Dominus Virus

Host and Prey
The Dominus Virus latches onto (or into) Crommens, who never notice. It evolved so it could get into Crommens unnoticed. Then, since the Crommen is a parasite, it would infect the eggs that are in the victim, and spread from the corpse. It does not affect Crommens, though. Ideal host: Crommens.