Zach had set a long-term goal for the Underworld Research and Extermination Club. But naturally, they couldn't immediately aim for the depths of the forest. Not to mention the time it would take, which they wouldn't get since they were busy with other lessons, there was also the increased level of danger in the forest.
Zach hadn't noticed it, thanks to the monsters avoiding his party. But the others had felt a heavy pressure from the monsters that hadn't succumbed and died to or fled the underworld energy. The monsters that remained, that embraced the underworld energy were more powerful than their healthy counterparts.
It came at the cost of intelligence and lifespan. In a sense, the current monsters inhabiting the Froltip Forest were similar to the tiger when it had decided to tap into the underworld energy in its leg. They were ferocious, powerful, and bloodthirsty.
