Black Swan

The Black Swan is a curse created by Maria Saverhagen to destroy Akabara and Adelheid. The base of the spell are the souls of Stella and her unborn child, and because of this, it targets young women who resemble Stella or the child. Hosts of the Black Swan are given five years to kill Akabara; if they fail to do so, the Black Swan consumes them and moves onto another host; however, this has never yet happened as Akabara has killed each one up to the 49th first. The Black Swan essentially gets stronger with every new host, inheriting all the memories, abilities, and spiritual power of its predecessors. The arms of its hosts have special markings on them, and are able to nullify Akabara's magic.

According to Kayuki, none of the Black Swan hosts have hated Akabara, even though he was responsible for the deaths of all of them except for the 50th.

History
The Black Swan was a spell created by Maria Saverhagen to destroy Akabara. Saverhagen created it through brutally murdering her adoptive daughter, Stella Hazelburke, as she had been pregnant at the time - the child, being Akabara's, could nullify Akabara's magic, and was thus targeted.

Upon the creation of the spell, the Black Swan found its first host in Cynthia, another one of Saverhagen's daughters. Cynthia pursued Akabara, but was killed.

The Black Swan later possessed Emily, the second host, but she was terrified of Akabara and was killed within the year.

The third Black Swan host, as she lay dying, was able to synchronize her soul with that of Stella's, temporarily giving her voice. Akabara and Stella collaborated to keep the world at peace and allow each new Black Swan host a free hand.

Nearly nothing is known about the hosts between three and forty-nine; however, Akabara, when confronting Yuki, stated that his magic was able to damaga the forty-eight host slightly.

The Black Swan eventually possessed Yuki Komatsubara, its forty-ninth host. However, like all of her predecessors, Yuki was killed by Akabara, this time through the use of Renka's spirit swords.

The fiftieth Black Swan was Kayuki Hirasaka.

List of Black Swan Hosts

 * The First Black Swan - Cynthia
 * The Second Black Swan - Emily
 * The Third Black Swan - unnamed
 * The Forty-Ninth Black Swan - Yuki Komatsubara
 * The Fiftieth Black Swan - Kayuki Hirasaka