T.D.o.N.B: The color of his eye

The chasm was slowly getting narrower and narrower as I descended hundreds of feet below the surface, rushing down the path and spiraling down the walls of this massive hole, and cutting down everything on my way.

The cyclops eventually changed a little bit. The ones I encountered deeper had tattoos covering their bodies. The skin color also began switching from a natural color for humans, more towards the variations of blue.

  With this progression, the beams shot from the cyclopses' eyes also got stronger, malting the stone around me, as they tried to kill me without any success on that field. I was too fast for them to focus on, and that seemed to be a core necessity to shoot the beams.

Right before my encounter with the boss, I found a group that had pure light-blue skin, and those dar tattoos swirling around their arms and torsos, to reach the head climbing the next. They all ended up wrapping themselves around the single eye.