The Anniversary Ball Attack was a conflict that occurred at the end of Antebellum Awakening. During the coronation ball of new High Priest, Derek, father of Bianca Monroe, Miss Mabel led an attack on Chatham Castle followed by a horde of Clavas.
The battle ended with a victory for the witches of the Central Network, the capture of Miss Mabel, the breaking of Bianca's Inheritance Curse and the destruction of her contract with Miss Mabel to kill the next High Priest which, unknown to Bianca at the time she made the deal with Miss Mabel, was her own father. The victory did not come without a hefty price. The Central Network's High Priestess, Mildred Graeme, sacrificed herself in exchange for Miss Mabel lifting Bianca's Inheritance Curse.