Violet
About
Violet is a very powerful witch, she uses of ice magic to a variety of thing like killing, torturing and entrapping. She is the killer of Cyrano and is manipulating Roxxane with the objective to acquire high amounts of Freezing Fire.
She can't kill Roxxane and Jail due to the Marginal blood, the Freezing Fire can only be collected if a Marginal uses the family scepter, so without any of them the mine of this stone will be lost forever.