Zestari aided her mother with timber production at a young age. When she was nearly two decades old she began practicing fighting with her father until his death a few years later at the hands of some occult monster. After his passing, Zestari was drawn into naturalism and began the study of creatures and natural orders. Zestari practiced higher education at The Lockwood Foundation for several years after gaining admission. She would go on explorations and observe local creatures before bringing information back to the foundation. In later times though Zestari left to go on her own adventures and explorations eventually joining the Fianna Mór.
At the behest of her then overseer, Professor Ambrós Ó Daire, she traveled to Áit an Bhróin and discovered a new taxonomy of massive predatory quadrupeds. She assisted her allies greatly during that time, plying her vast wealth of scientific and scholarly knowledge to their gain and her credit eventually reaching the rank of Professor.