Due to the Collector's shadow appearance, some speculate that he is made of the Void much like the vessels, the Knight, the Hollow Knight, and the Kingsmoulds.

Defeating the Collector unlocks the 'Obsession' achievement in the PC and Xbox versions.

Hollow Knight Boss Discussion - The Collector Trivia Defeating the Collector grants the Knight the Collector's Map, which labels the locations for all remaining Grubs that the Knight has not yet rescued from their jars. Upon defeat, the Collector lets out one last hysterical laugh before falling over and disintegrates into a puddle. Upon defeat, the Collector becomes permanently stunned, allowing the Knight to deal the final blow. Having the Nail upgraded to the Channeled Nail or higher is recommended as it defeats all three enemy types in one hit.

After several jumps, he will leap to the ceiling above and throw jars from below, some of which contain three common enemies: Vengeflies, Baldurs, and Aspids. Occasionally, he will attempt to grab them at the best timing. The Collector is a nimble foe and rapidly jumps across the room, avoiding the Knight's attacks. Upon reaching the top of the tower, the Knight will be attacked by the Collector, who laughs insanely before beginning the battle. During the climb, the Knight can hear sinister laughter. The Tower can only be entered from the deep elevator shaft between Kingdom's Edge and the City of Tears. The Collector can be found within the Tower of Love in the City of Tears, which requires the Love Key that can be found in the Queen's Garden.

Hollow knight ghost bosses