Quote Originally Posted by Metastachydium View Post
It is part of the creature, but it isn't part of the creature's body, strictly speaking. I meant to stat it up as a shoulder-slot magic item kalypthena drop when killed. It might indeed be overcomplicating this, though. Should I just switch that to natural armour?
I would do one or the other, just for the sake of clarity. That it is treated as an item but doesn't give rules for how the item works seems to be the confusing part.

Quote Originally Posted by Metastachydium View Post
I mostly just ignore the official lore on pretty much everything official, so I usually don't bother to give my critters anything like that. That said, I like your idea and might incorporate something like that into the fluff text if you don't mind.
I suppose that explains the lack of lore on the rest of the creatures. Feel free to use anything I suggest.