Sophistication
The Shionel inland taipans and the bloodfury rabbits all led a rather simple life on their respective floors. They simply consumed organic ore deposits and other creatures that stumbled in like the adventurers. It had given him the impression that monsterified creatures were too sick in the head to possibly be more than aggressive mindless zombies.
Seeing what had happened to the humans of the large town of Veril that had survived ingesting the esoteric ore deposits had only reinforced this notion.
Yet the previous floor had had a perfectly viable ant society with functioning ants that worked for the sake of the colony and were led by the intelligent ant queen who was even capable of reproduction of monsterified ants.