Meaning, literally, "black mass". Refers to the area of the brain near the center (the midbrain). Contains melanin (which makes it black), synapses which don't act like any other synapse in the brain (the dendrites release neurotransmitters, along with the axons), and a bunch of neurotransmitters such as dopamine. Appears to work by stimulating a massive number of cells by neurotransmitter saturation.