Polluted Land.
A medium-sized pollutant aimlessly wandered through the Corpse Swamp, with each step, a layer of "grease" would slide off its body, leaving a thick "oil trail" as it moved.
It wandered like this until it reached the edge of a small hill made of corpse piles.
Medium-sized pollutants possessed a certain degree of intelligence.
But not much.
Therefore, it felt that something was off about the Corpse Mountain before its eyes, which didn't quite seem like a natural product of the Polluted Land, but the overwhelming desire to feed still overpowered its limited intelligence, prompting it to stop thinking and head straight for the mound, burying its head into the mountain of corpses.
Soon, this silent place was filled with the cringe-inducing sound of chewing.
It gnawed at the remains of these pollutants, or rather, it fed.