Skip to 2:17 if you do not care about the path to the egg. Moreover, skip to 5:08 if you only care about the cutscene, not the platforming section.
A cutscene from the Birthplace located in the Abyss. You must have the Kingsoul to open the way to the Birthplace. Then, you will have to scale your way through some platforming until you reach the top, which will reveal some lore on "The Knight"(Player) and "The Hollow Knight"(Boss). Upon completion, this will replace the Kingsoul with the Voidheart, which grants you access to an extra ending and shades are benign to you.
