ワルギリア

Virgilia was the previous Endless Witch before Beatrice, and was also her teacher. Her new name (having passed her old one to her student) comes from the Divine Comedy character Virgil, who guides Dante through Hell and Purgatory to Beatrice, who is his guide through Heaven. She is a silver-haired witch with great powers, despite surrendering most of them to Beatrice with the title of the "Endless Witch".[From Wikipedia]