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 may be found at the entrance of the cave that leads to Brooding Mawlek after Forgotten Crossroads become infested.

Жужжалка Грузер Gruzzer