Sarah

A mysterious girl who manipulates the power of darkness, Sarah makes her first appearance in Volume 4, casting an unsettling shadow over the story with her overwhelming dark magic. During the Keith Claes kidnapping incident, she reveals herself as the true mastermind. From then on, she operates behind the scenes in numerous incidents related to dark magic, seeking to strengthen her abilities further by obtaining forbidden tools such as the "Familiar of Darkness" and the "Tome of Dark Contracts." However, after many twists and turns, all these items eventually end up in Catarina Claes's possession.

According to investigations by Geoffrey Stuart and Suzanna Randall, Sarah was once among the slaves collected by the Dieke family to experiment and research dark magic. While most of the others lost their sanity, Sarah alone ended up possessing an abnormally large amount of dark magic. After gaining her freedom due to the collapse of the Dieke family, she now wields her power as if defying her own fate. It is also a significant mystery that the name Sarah is an alias, and she has no true name. In Volume 8, the existence of a man who once saved her is revealed, and her faint feelings for him are secretly engraved in her heart.