Valkyr are an artificially-created species affiliated with the Children of Perdition.
Valkyr are an elite all female airborne unit. Rather than using traditional airships they use the gift given to them by Asmodeus. Their wings.
Valkyr are handpicked by Asmodeus himself, and to become one is a great honor. The ritual in which the person transcends his or her previous form and becomes a Valkyr is known as the Ascension. During it, foreign cellular material imbued with the will of Asmodeus is absorbed into the host body. The material then goes on to morph the body according to his will. The overall procedure can last from several hours to multiple days. Although it is rather painful, the Valkyr report that afterwards there is a lingering sense of ecstasy.
All Valkyr have wings, elemental powers, and the ability to wield Kanohi. They have powers that are unique to each individual. Some are: