Bone collectors are a species of wild animal that populates the worlds of The Darkness, primarily Umbra. No one knows much about them since they exist in complete darkness; however, they’re predators, very fast, and only interested in extracting and eating bone. That pesky flesh just gets in the way!
They’re considered scavengers among members of The Darkness, who are powerful enough to usually ignore them (and many of whom also lack bones, so). Of course, anyone without those powers – such as folks who need light to see – are in big, big trouble.
They take bones. They eat bones. They keep bones. There are rumors of immense, intricate palaces of bones, hidden deep underground where no light will ever reach… but that’s just rumor, right?