Kerya has always been a major flirt. She would bed many men for years until one day, her beloved goddess, Hera finds out.
Hera, as punishment for Kerya's sins, places a curse on her. For everyone she kisses, a terrible fate shall befall them.
Most people would learn her lesson but Kerya takes it as a challenge. Kerya, amused by Hera, breaks her oath to the goddess and takes up an oath with Hecate.
She then uses her "curse" to gain the things she believes she deserves. She also seeks the followers of Hera as payback for the curse placed upon her.