Morlocks

The result of a strange mutation that can occur when humans (over multiple generations) spend too long away from the light of the Sun, Morlocks are brutal monsters that dwell in the tangled tunnels of the upper reaches of SubTerra Their wiry frames mask the strength of their limbs and their swift reactions, and their arms are long enough that they can drop into an uncanny, four-limbed shuffle for speed or stealth. The mutation that Morlocks undergo seems to make them forget that they were once human, although many Morlocks still dwell in the shattered ruins of their ancient homes. Some Morlocks worship the statues of humans from these bygone eras as gods, but others now worship The Cruel or Asmodeus or other violent deities.
  Morlock young are insatiable and clamor for even the slightest morsel of food, even consuming their siblings if no other meal presents itself. Most morlocks encourage the practice to ensure their ancestral group as a whole grows stronger.
  A typical morlock stands just over 5 feet tall and weighs roughly 150 pounds.