The young elf doesn't remember a time before the Order of Ereshkigal. She knows that she had came from the northern woods of Elmar, where the secretive elves live in their great kingdom. She also knows that, twenty-five years before, she was rushed away from a burning forest, cradled in the arms of a man clad in bone white mail, screaming in pain from burns.
For several months, she verged on the brink of death, in constant agony as blisters opened and healed. THroughout, the man in white mail treated her and kept her under constant surveillance, wondering if she could recover from the massive burns without magical aid. Miraculously, she did, with surprisingly minimal scarring, most of the scarring on her back and neck, though her mind was nearly snapped from the pressure and trauma.
She learned the name of the young human, Nergal, and learned that he was a knight in the service of the Order of Ereshkigal. A week after he knew that she would not die from her wounds, he left, leaving her in the care of a kindly innkeeper.
The young elf could not accept the mysterious man in white mail leaving her; when she was able to move comfortably without assistance, she left the innkeeper, trying to track down Nergal. For five years, she traveled the lands, looking for him, until she ran into him on the remains of a battlefield. Nergal, impressed with her tenacity, took her with him to the headquarters of the Order, where he asked to have her as his squire.
Thus, the elf served as the knight's squire for the next eighteen years, learning how to fight, ride, and, most importantly, how to study death with a keen mind.
After eighteen years, the Order decided to induct her as a knight-errant, and sent her out into the world for the next five years, to study death on their own terms. Before they sent her, they realized that she had no name for the past twenty-three years. Thus, they christened her as Firathir, the Dark Protector.