Valkyrie

A Valkyrie (ヴァルキリー) is a type of person considered to be similar to a Saint or an Angel in that they act as a bridge between man and God, thus there are many kinds of magic related to Valkyries. This includes ways of sending warriors' souls to Valhalla, ways of recreating weapons that Valkyries used and even ways of "creating" a Valkyrie without the help of Gods. There are limitations with "artificial" Valkyries but occasionally, there are people born with the qualities of a Valkyrie and are much stronger than the artificial ones, like Brunhild.

There are many theories about what a Valkyrie is and how to become one. One of the theories say that a Valkyrie is not a God, angel, fairy or some other divine existence. Instead they may be just normal human girls who wish to fight more than anything. Once Odin grants her this wish and gives her power, she becomes a Valkyrie.

Valkyries are introduced in the Toaru Majutsu no Index: Kanzaki SS and Toaru Majutsu no Index Light Novel Volume SS2 stories.