The Siblings are the discarded Vessels of the Abyss, the Knight's own kin. They are both a tragic lore beat and a real enemy you fight.
The Siblings are one of the saddest pieces of Hollow Knight lore. Per the wiki, they are the failed Vessels that the Pale King discarded into the Abyss while searching for a single pure one to seal the Infection.
According to the wiki, every Vessel is a sibling of the Knight, including the chosen 
Hollow Knight and the half-sibling 
Hornet. The word covers a whole family of Void-born children, not just the weak enemies at the bottom of the world.
The wiki notes that the Siblings also exist as an actual enemy in the 
Abyss, the Shades that crawl from the shells of dead Vessels. In practice, this is the only place you fight your own family in the game.
This guide covers who the Siblings are, the family tree behind them, the Sibling enemy and how the Void Heart changes it, and the notable named siblings worth knowing.
The discarded Vessels of the Abyss, all children of the Pale King and the White Lady. The Hollow Knight, the Knight, and Hornet are all siblings or half-siblings. 25 health each, found in the Abyss, dealing two masks of contact damage.
The Void Heart turns every Sibling peaceful so they stop attacking.Per the wiki, the Vessels are genderless beings of Void created by the 
Pale King as a means of stopping the Infection. They are described as the progeny of the Pale King and the spawn of the White Lady, carrying the soul of both.
According to the wiki, the Pale King needed a Vessel that was truly hollow, with no mind, will, or voice that the Radiance could reach. The birthplace cutscene quotes him directly: "No mind to think. No will to break. No voice to cry suffering. Born of God and Void."
The wiki specifies that he tested countless Vessels and threw the ones he judged impure into the Abyss below the kingdom. In practice, that pile of discarded children is what the Siblings are: the ones who were not chosen.
Per the wiki, the Pale King's line "Soul of Wyrm. Soul of Root. Heart of Void." names the three parts of every Vessel. Wyrm is the Pale King, Root is the White Lady, and the Void is the darkness in the Abyss that fills the shell.
Per the wiki, the Siblings share two parents. The Pale King is the father of every Vessel, and the 
White Lady is the mother. She confirms this herself, calling the Vessels her spawn rather than mere constructs.
| Sibling | Relation | Note |
|---|---|---|
| The Hollow Knight | Chosen Vessel | Judged pure, sealed the Radiance |
 The Knight | Discarded Vessel | The player character, climbed back out |
| Hornet | Half-sibling | Shares the Pale King as father |
 Broken Vessel | Discarded Vessel | Infected, fought in the Ancient Basin |
| The Siblings | Discarded Vessels | Shades risen from dead shells |
According to the wiki, Hornet is a half-sibling rather than a full Vessel. Her mother is Herrah the Beast, one of the 
Dreamers, who agreed to bear the Pale King a child as her price for the seal.
The wiki notes that Hornet calls the Hollow Knight her sibling and the Knight her sibling too, which ties the whole cast together. In actual play, that line is the clearest in-game confirmation that these characters are one family.
Per the wiki, the Sibling is a proper enemy with its own Hunter's Journal entry. You meet them after dropping past the King's Brand gate into the Abyss, near the Lighthouse and the Birthplace at the very bottom.
| Detail | Value |
|---|---|
| Health | 25 |
| Contact damage | 2 masks |
| Hunter's Journal | 25 kills required |
| Locations | Abyss Birthplace, Lighthouse, Black Egg |
| SOUL on kill | None |
According to the wiki, the Siblings fly straight at the Knight and deal two full masks on contact, which is punishing in a dark area with little room. They look like the Shade the Knight leaves behind on death, because they are the same kind of thing.
The wiki specifies that killing a Sibling grants no SOUL, so there is no farming benefit. In real runs, the only reason to fight them is the journal entry, which needs 25 kills before the area changes.
Per the wiki, once you claim the Void Heart, the Siblings stop being hostile. They no longer deal contact damage, and a single hit makes them dissolve. In practice, finish the journal entry before upgrading the Kingsoul if you want the kills to feel like a fight.
Per the wiki, a handful of siblings stand out from the nameless crowd in the Abyss. Each one is a Vessel that ended up somewhere other than the discard pile.
According to the wiki, the Hollow Knight is the sibling judged pure enough to contain the Radiance. The Pale King raised it in the White Palace, and that bond is what the wiki notes may have tarnished its purity and let the Infection leak.
The wiki specifies that the Broken Vessel is another discarded sibling that climbed partway out before the Infection took it. Its dream form, 
Lost Kin, is the same Vessel seen through the Dream Nail, faster and tougher.
Per the wiki, the Knight you play is itself a discarded Vessel that escaped the Abyss and returned to Hallownest. In actual play, the whole game is one sibling coming back to finish what the chosen one could not.
The Siblings tie into the Void Heart arc, the endings, and the boss roster. These spokes pick up the connected threads.
Game data and screenshots adapted from hollowknight.fandom.com, used under CC BY-SA 3.0. Original content remains the property of the wiki contributors and Team Cherry.