Grendel have, compared to uninfected Orks, a stronger, usually matted head facial and body hair, which may be called a coat. Their tusks appear more prominent and they have greatly extended arms. When they move on all fours rather than on two legs, they can reach amazing speeds.
Though little is known about the Grendel, they appear to favour the cellars of abandoned buildings, abandoned subway tunnels and other undercround structures, probably due to their sunlight allergy. They retain much of their Ork metatypes abilities, such as low light vision, but also gain new ones, such as Thermographic Vision. Known to exert an uncanny control on vermin, they can sometimes be found with entire packs of rats that they keep as guards and/or pets. They are solitary scavengers who - according to previous observations - rarely live together in intimate relationships. Grendels mainly feed on dead animals but will consume anything they find edible and are not known to distain metahuman flesh.
A large population of grendels appears to be thriving Catacombs of Paris.
The average duration of a transformation orcs after infection with MMVV-II is 18 days
- Goodman, Patrick. "SR3 Stats for New Infected" (originally written for Running Wild).