Maryann

Marriane is a former godchild of Cosmo Cosma and his wife, Wanda Fairywinkle.

According to Wanda, she abused their magical powers by wished that Franz Ferdinand, the Archduke of the Austro-Hungarian Empire, would be assassinated, thus throwing the Earth into World War One.

It is unknown how she was able to wish that he would be killed, becausze in the Da Rules, it states that a godchild cannot wish someone dead.