Helga Piarosa served as a contracted mage for Lord Villar Constance, a prominent noble of the Fantasia Union. She belonged to his direct cadre of mages, alongside Margaret Odius, Laura Hardry, and Colleen Messala. Her specific magical abilities during this service remain unspecified.

During the Factory Alliance's assault on Castle Unicorn, led by Margrave Marrine Kreische and Milza Kuces, Villar Constance and his allies faced defeat. Margaret Odius perished using potent fire magic to protect Villar. Laura Hardry chose suicide after delivering a defiant message to the victors rather than defect.

Seeking survival, Helga Piarosa directly approached Marrine Kreische in the battle's aftermath. She negotiated for her life by offering her services as a healer, pledging to treat wounded soldiers from both the Factory Alliance and the Fantasia Union without bias. This pragmatic offer secured Marrine's mercy.

Her life before serving Villar Constance, her activities following the fall of Castle Unicorn, and her fate after her lord's death remain undocumented.