Smokey, but repurposed to be a monster for a labyrinth roleplay! They're a monster with Density Manipulation powers. They can change the atom density of anything for three minutes. He can either make it much more dense, so it becomes impenetrable and incredibly heavy, or can lower the density to the point where one could pass through it entirely. They can apply this effect toanything, so long as it's smaller than a mattress and they're touching it. She's weak to pressure and gravity. If something is pressing on them physically or there's too much weight on them, her entire form will become unstable.. If it gets too extreme, she will implode, much like an atom splitting or a supernova.