Fang Mu had already contracted with the Vicious Illusion Sparrow.
With the Contracting Blood obtained, Fang Mu could now contract with special-grade pollutants.
Fang Mu had been trading with the Green Magician from Ancient Genesis.
Fang Mu provided resources to the Green Magician without restricting the level of pollutants he could get in return.
He acquired many pollutants of low, medium, and high levels.
High-level pollutants were good supplies for those forces selling pollutants.
However, in Fang Mu's case, he only valued special-grade pollutants.
Pollutants below special-grade were all given to Xi Xi to digest.
Xi Xi would condense these pollutants into contamination crystals.
Fang Mu planned to keep these contamination crystals after contracting pollutants to upgrade the pollutant levels.
The upgrade of pollutant levels was not limited by the level of the Beast Masters.
