Xerxsephnia von Blitzengaard is a sister of Martellus von Blitzengaard (AKA Tweedle). She goes by the nickname Seffie. She has been at least an acquaintance of Gilgamesh Wulfenbach since they were children. She [ first appears] [[Chronology - Volume #|✣ ]] in The Refuge of Storms soon after Tweedle, Agatha and Co. emerge into the fortress from their time-delayed trip through the Monolith portal. Apart from her rather.. intense.. attitude towards Gil, her ultimate goals and true loyalties remain open to question.