Each bat wasn't big, only about the size of an adult's palm.
However, it was somewhat difficult to deal with a pack of bats.
Most importantly, Klein could already tell the species of the bat.
If he guessed correctly, the bats in the tree hole should be the legendary Vampire Black Bat.
Although the toxins on these bats weren't fatal, they ate human blood as food. Once someone entered, it was equivalent to a huge blood bag.
The Vampire Black Bats' buffet began as well.
It wouldn't be a big deal if there were only one or two of them sucking some blood, but these groups of bats were probably only willing to stop after sucking people dry.
Klein couldn't help but panic when he encountered something so difficult to deal with.
As he waved his clothes to chase away the bats, he also searched his backpack for a magic treasure that could counter the enemy.