Skulloids

Unknown species, using skulls as "mask" to hide true form; no known order in society; can speak, but speech is often slurred; Once put on, mask cannot be taken off by an outside force (somewhat melded to face); Can use bottom of skull , but more often both or top; Identifiable by large, black, void-like body; have the ability to melt in to the shadows and form objects or tools from shadow "body"