Building a shape shifter with interesting rules

[ericthered]

Originally Posted by Not another shrubbery

Does this mean that if any bones are broken, the creatures don't heal at all, or just that the broken bones don't mend?

the broken bones don't mend. The bones don't belong to the creature at all, they get them from other sources. In fact, the bones don't even have to be "bone", or from a real animal, the creatures can use bones made of wood, stone, or metal. In a high tech setting, I'd let them use plastic. The trick is they can't copy individuals with these bones, and look kind of odd when they use them.