The undead give a lot of play, it can be a rotten corpse a fresh one or even just bones.
Non-death is a condition not a race if the renegades are half-rotten Humans which is a bit absurd since some have not been dead for a long time and others have been years and should be a pile of bones.
there is no reason for other races not dead either.
the only limitation is the refusal to model them of the DEV.