In the beginning, the land that would become Hallownest prospered under the guidance of their leader Erebus. He longed to solve the riddle of immortality for his people - an ability only he and his first creation Void possessed. His efforts met with failure, as mortal flesh could not sustain the undying spirit. Erebus was obsessed in his effort to eliminate death from his world. When the Ancients discovered the secret of immortality, Void deemed the knowledge too dangerous to share, for in his judgement Erebus had come to be seen as an eventual threat to all life. Void acted in secret with the Ancients, and worked quickly to seal the world away, and Erebus with it, while the records of history were rewritten to hide the truth. Enraged, Erebus became the Shade Lord as vengeance and hatred consumed him and his world, transforming it into what is now known as Hallownest, and the lands beyond. And right at the center was the Abyss, an endless sea of darkness. The Kirby species is what spawned from the single tear Void shed on that day.
"We need to close the connections to the first world... for you're not the same Erebus I once knew. I'm sorry that it had to come to this. Father... thank you for everything." - Void