Gruzzer

Behaviour and Tactics
Flies around, bumping into walls and objects, changing direction on contact.

It's best to trail behind it and then strike it down.

Trivia

 * On the official website, it is referred to as "Droobling Muzznik":

"These morose-looking flies buzz around haphazardly through the caverns, bouncing off of walls and irritating travellers."
 * Gruzzers are really rare once The Forgotten Crossroads become infected, making it harder to complete the Hunter's Journal if the player hasn't killed enough of them before. However, two Gruzzers can be found at the entrance of the cave that leads to Brooding Mawlek, even after the infection spreads.

Жужжалка Грузер Gruzzer