Eleventh of the Adepts, known as Black Diamond, she is Joshua's sister, whom she treats as a fool. Her element is carbon, she can create bladed weapons at will. She was initially very harsh towards Tomo, addressing her as a loose woman due to her good looks, though she apparently developed a crush on her, slowly opening up, especially after Tomo saved her when Georg Tanner forced her to take the blame of a fight he had provoked.

(wikipedia)