Spoiler Alert: WARNING! This page happens to contain a lot of heavy spoilers that are all originated from the Overlord author, Kugane Maruyama and his collection of written works. Anime-only watchers and Manga-only readers, please take some time off to reflect it over for a bit before choosing to expose yourself on reading the information below recklessly.
Spriggans (スプリガン) are a demi-human race native to the Abelion Hills.
Spriggans were fundamentally a kind species and those of their race with evil tendencies were very rare. That said, both good and bad ones were unmanageable when they went on a rampage.
Spriggans could freely change their size from small to large.
In English lore, Spriggans were said to be the bodyguards of faeries. Although small, they were usually considered to be the ghosts of giants, that is the reason why they could freely change their size from small to large.