Erleah Stassatis

Erleah Stassatis (エアリア・スタッサティス, Earia Sutassatisu) is an enigmatic Mage who belongs to an independent Guild named Valhalla. Being among its small number of S-Class Mages, she holds a grand amount of innate magical power. Seeing the fact that she rivals her superiors' strengths to a large degree, Erleah is even sometimes dubbed as the Guild Ace (ギルド エース, Girudo Ēsu). However, when her magical strength noticeably began to increase into an uncontrollable point, she became an ambulant in search of something that could hinder it.

Quotes

 * (To herself) "While others hunt for more power, I search for less of it."