Death of Rosie to the birth of Prima Rosaline.

[Rosie]

Rosie after spending a half-year in Kiwike become mentally unstable. She began to hallucinate the past lives of those dead and thought she was somebody else at most times.

Her death occurred when she began her second day of training with Allen Motio, the Ice Alchemist.
After teaching her the basics and learning how to transmute he attempted an experiment that no mere mortal can should ever attempt. Creating a life form.
As they placed their hands over the jar of materials and the lightning pulse of the art of alchemy emitted, they were both struck. The price of the jar was to low to suit the needs of this transmutation. It absorbed Allen's arm and worse yet... took Rosie's life and body.

As her soul was ripped from her dissolving body it was cast into the nine hell's for a second but felt what like an eternity.

What returned in a new child-like body was no longer Rosie... but a lesser, weak demon called Prima Rosalie.