A callus executioner with a warped sense of justice, trusting only in her own judgment, often to the detriment of the wrongly accused.
She no longer has any interest in hearing the testimony of others, instead leaping to her own conclusions in a mockery of her once-impartial ways. Frey experiences this first hand when she is accused of Tantacide and sentenced to a deadly Trial by Water.
The extent to which Prav's mind has fractured is evidenced by the literal split in her personality.