Barthomeloi Lorelei

Barthomeloi Lorelei (バルトメロイ・ローレライ), The Vice director of the Mage's Association.

She is the boasted "Queen" (One of the Greatest Modern Magi) of London's Clock Tower, the central institute of the Association. She is able to take on a Dead Apostle Ancestor by herself, and she has already destroyed 2 of them.

An orthodox magus without any unique thaumaturgy, but because her own abilities are among the highest, she has produced brilliant results in all situations.

While she herself is a brilliant magus, she takes with her 50 elite magi that she personally handpicked to annihilate her enemies. Sort of like a young emperor leading an orchestra.

While the members of her band are first-rate magi, even without them, it's said that she could go face to face with 27 level Apostles on her own. Even though her squad of mages had a choice of erasing the whole castle of Louvre from existence instead of fighting him, she chose to go fight him directly.