But Yue Zhong had long escaped behind the Mutant King Rat, and had readied another fireball. He fired the ball of fire towards the back brain of the Mutant King Rat.
There was a massive “Bam” sound as the fireball hit the Mutant King Rat. After the smoke cleared, Yue Zhong was startled to see that the fireball has only created a black burnt mark on the hairs of the Mutant King Rat and that fireball was unable to penetrate the skull.
“An impressively hard skin and skull!” Yue Zhong cried out in alarm. This is the first time he had encountered a mutant beast that even his fireball was unable to harm.