Svanhvít

is the Noble Phantasm of Valkyrie. 
They were rewarded with swan-white clothes from the Almighty God Odin. When the Valkyries put this on, they possess the ability to fly; it’s possible for them to maneuver at high speeds. When pegasi aren’t available, it’s not an overstatement that this Noble Phantasm is the primary contributor to Valkyrie’s mobility. However, the true value of this Noble Phantasm goes beyond enabling aviation. Its true ability is the divine protection of the Almighty God Odin - Norse Mythology’s greatest existence. Because of this, it preserves the absolute nature of Valkyrie’s mind and soul. Magecraft and abilities that could potentially affect the mind are completely repelled, and on top of deflecting physical attacks of Rank B or below, their bodies do not change even after massive intake of calories. There have been multiple anecdotes wherein their removed garments are hidden while bathing, resulting in situations like「I have to get married now….」; be careful.Fate/Grand Order material VII - Valkyrie, Profile translated by Smoof101
In Fate/Grand Order, it is instead the Skill Swan Mystic Code.
==References==
Category:Anti-Unit Noble Phantasms
Category:Noble Phantasms
Category:A rank Noble Phantasms
Category:Mystic Codes
Category:Noble Phantasms introduced in Fate/Grand Order
Category:Noble Phantasms of the Valkyries
Category:Clothing