Valkyrie

Female figures of Norse mythology who choose who lives and who dies in battle. They are said to serve Odin. 

Valkyries are extremely rare and are thought to be extinct since Odin hid Asgard from humans. They are said to travel the Nordic regions protecting Odin’s land from those who would do it harm. 

• Half-Valkyries do not exist. 
• Exclusively female.