A Different Fishing Net

The Vampire Bats were swift and terrifying. To buy some time for the Twin-headed Ogre and Dogmen in front, Yang Ling rode his Unicorn and led the bats the long way around the mountains. When he was sure his group was no longer in immediate danger, he sped toward the forest where they had laid their traps.

As he passed a battle trench, he ordered the Evil Eyes that he had laid in ambush to attack, releasing a wave of concentrated blinding light. But to his surprise, the Vampire Bats were unaffected, and they continued their pursuit unharmed.

Echolocation?

Turning back to look at the Vampire Bats, Yang Ling realized that the unique ability of bats to use echolocation was probably much more essential to their health than their eyes, which were mere supporting actors in comparison.