Sarossa is the daughter of Godsmen Factol Sandoz and the sister of Saros. She can be found in the Godsman Hall in the Great Foundry. If asked, she will tell TNO that she doubts her brother's dedication to the Godsman cause. She can offer advice on how to convince Sandoz to not kill himself. Once TNO is a Godsman, talk to Saros and he'll mention his sister's special power to look into a person's mind and change something.. Talk to her and confess devout faith in the Godsman cause and she'll use her power to grant TNO permanent +1 to wisdom.
References[]
http://www.sorcerers.net/Games/Torment/Walkthrough/act5-findravel/findravel-foundry.php#main_hall