Dream - Crustacean People - Blood Vampires

this was kind of a strange dream (aren't they all?), regurgitated in fragments, maybe the full-on version was 'just too much' to recall, but it goes something like this: 

• space vampires
• crustacean bone set
• fake human skin
• real meaty marrow
• directly feeding off human blood

 those are the fractures of images I retain. But it was 'weirder' than that, in that the outer-bones of these creatures were black - think of black pudding. They assumed the shapes of Human Muscle, too. Their external bones were hard, real hard, like tar or plastic. Inside was this ground-up meaty broth for bodily fluids. And on the outside they had this skin which resembled (or imitated) human skin. I can't remember if they were cold-blooded or not, you know, "Cold to touch." When you cut their fake skin (I did this to them with a knife, and they did this to themselves as fangs came through) it heals itself around any puncture site. They were 'talking to me' but I don't remember what they were saying, can't tell whether they were 'good guys' or 'bad guys'. No 'specific vibe' from these Crab People - I'm saying this just to remain neutral in my opinion of 'them' and 'the dream'.