Sister Yolandi, like many of her sisters, was an orphaned girl picked up from some backwater hive long forgotten. Brought to the Schola Progenium on Scintilla she learned the blessings of the God Emperor.
Always inquisitive, she constantly had questions for her tutors, a trait unwelcomed in the ecclesiarchy's halls, but one the Inquisition took notice of and fostered. Soon she became an instrument to root out witches and cultists.
Soon she was sent with a small congregation to a Penolpass, a feudal world in the Malfian sub-sector. She adopted quickly to the feudal customs, another trait appreciated by the inquisition.
When the blackships arrived to collect the planet's witches, Sister Yolandi was asked to come along. She said yes and jumped on board so fast the Inquisitor had to catch up to her to show her the proper place to observe the witches in transit. Thus began her official initiation.