Hilda was formerly number 6 of the Organization. She was active at the same time as Miria and they were close friends.
When she reached her limit, she gave her black card to Ophelia asking her to pass it on to Miria. Ophelia instead ripped it apart, condemning her to become an Awakened Being. She was later hunted down by a team including Ophelia and Miria. Hilda was slain by Miria, who at that time didn't realize her identity. After Miria realized it was Hilda she had just killed, she temporarily lost control of her Yoki powers which led her to partially Awaken. Years later, Miria stumbled across Hilda's sword, which Hilda had lost when she had Awakened. Miria placed the sword in the ground where Hilda died, in memory of her friend.
In her awakened form, she resembled a humanoid with what looks like mummy wraps around her body that can be extended.
