Belfly

Behaviour and Tactics
It hangs from a ceiling, emitting a high-pitched squeak. Listen carefully for this sound as it is usually found in dark or secluded places, where spotting it usually means that it's too late to avoid contact with it.

Upon seeing The Knight, it emits a louder shriek, exposes its glowing belly, then swoops down on the Knight, exploding on contact and dealing two masks of damage.

Its homing is limited to a wide arc about 90 degrees below it, after which it will continue in an arc until making contact with the environment or the Knight. Dodge away when it dives in and let it explode against the surface it impacts. The blast also instantly kills any enemy in its area of effect.

It is possible to kill it before it dives as it dies in one hit even with the un-upgraded Nail; however, timing this is difficult. Spells, Nail Arts, and Grubberfly's Elegy can be used to dispose of it from a distance.

Killing this enemy is no longer needed after the Lifeblood update as if it is activated by the player and kills itself, it still will count towards its entry in the Hunter's Journal.

Locations
They can be found mainly in the Royal Waterways and Kingdom's Edge, however they can also be spotted in smaller number throughout the City of Tears and north of Ancient Basin

Trivia

 * It can be pushed back from the Knight to avoid damage by using Dream Nail.

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