Midzyas/Way of the Nail

The Void Hunter is a hidden boss in Hollow Knight: Way of the Nail. He is essentially Midzyas' higher being form and the true final boss of the game. His immense power is shown when he atomizes the Nail Lord after entering his arena with the criteria completed.

Triggering the Fight
There are a few criteria for triggering the Void Hunter boss fight. All must be followed or entering his arena will not spawn him.
 * Scorpion and The Nail Lord must have been defeated first.
 * All four Void Beacons must be activated.
 * They are located in the City of Silk, Forests of Soul, The Light Grotto, and The Capital Of Firecrest.
 * They will not spawn until the Nail Lord has been defeated.
 * Interacted with the boomerang left behind by Midzyas and have talked to Scorpion after interacting with the Boomerang.
 * All Nailmasters must have been interacted with.

Mechanics
When the arena is first entered, the arena will be locked and a second boss battle with the Nail Lord will trigger. After his first phase HP has been depleted and he performs one second phase attack, the battle will abruptly end as a dark, winged figure drops into the arena. It will then stare at the Nail Lord for a brief period of time. Afterward, he will dash behind the Nail Lord and stab him with one of his Void Lances. After being attacked, the Nail Lord will dissipate, utterly obliterated by the Void Hunter. Afterward, the Void Hunter will stab his tendrils into the ground, corrupting the arena. After the arena is fully corrupted, the Void Hunter will let out a terrifying roar, staggering both Red and Gromb before the battle begins. But before the battle truly begins Red and Gromb would enter sync mode. Sync mode would last for the entire fight.