Yeah, one of the important factions in the series is a group called the "Mord Sith." Their main weapon is "a magical rod that causes constant pain to anyone who touches it."
From the wiki:
Candidates to become Mord-Sith are selected from the gentlest and kindest girls in D'Hara, regardless of rank, wealth or any other factors. The kindest girls always make the best Mord-Sith because they have the farthest to fall. Mord-Sith must have no siblings. They are kidnapped along with their parents and trained from a young age on three levels. Each time, she must be "broken."
The first breaking is a time during which she is tortured to the point of obedience so strong that she would do absolutely anything her master/mistress tells her, without question or hesitation. This part of the training breaks her of her sense of self and personal desires.
During the second breaking, she is forced to watch as her teacher slowly and brutally tortures her mother to the point of being broken, and eventually, death. This is to rid her of compassion.
The third, and arguably the most difficult, breaking is when she is given the instrument of torture and must inflict pain and suffering upon her own father until he breaks as well, and then she must kill him. When she has completed this task, she is a full Mord-Sith.