Obtaining a part of the Sludge Monster was, of course, very difficult.
Stone, who once fought alongside the Sludge Monster, knew very well that although these monsters seemed to be everywhere, as ubiquitous as mud, in reality, every bit of mud was a complete individual. They certainly would not move while leaving traces behind, let alone the possibility that the one in this mansion might no longer be the original Sludge Monster.
Lu Ban had encountered Sludge Monsters at Nanhua Private Renji Hospital, in the Wasteland, and in Abandoned Capital, and it was clear that they were not the same kind. There was a continuous relationship of improvement between them.
For example, the initial one from the Wasteland was the original species, directly evolved from the Clan of an Ancient Overlord, but after being modified and merged with humans, it developed a powerful mimicry ability, even capable of disguising as humans and transforming into swarms of insects.