Vengefly

Behaviour and Tactics
Hovers in the air, moving around a small area. Emits a squawk before homing in on The Knight when they come in range.

One of the first and easiest enemies in the game. Either stand still and strike when it gets within range, or jump and strike down at it. Either way, it will continue to move towards you, allowing you to stay in one place and continue attacking until it is dead.

Trivia
On the official website, it is referred to as Vengeward Buzzerfly:

"Once this flying predator has caught sight of its prey, it will hunt it relentlessly through the darkness." Vengamosca Мстекрыл