The shadow guardians, also known as shadow dancers, shadow people, abyss guardians or abyss people, are mysterious and intangible entities who appear behind and around the Dark King whenever he is upset. Once he has calmed down, they retreat to “whatever void they live in”, as Seth noted. It seems that most of them are female, since they are described as Niall’s handmaidens, though a male shadow dancer was also mentioned in Fragile Eternity. When not comforting Niall, they are seen dancing gleefully and endlessly. Despite being intangible, they can touch him and he can also touch them.