Well, the main reason you need to rescue Penumbra is to get a book needed by Corinna. After that, you would at most see her once. Spoiler ~~[color:"#27384A"]By asking for 'special treatment' in the brothel, you would get into Penumbra's room with the spike bed, whips and chains, loose most of your hit points and get a few experience points.[/color]~~ (highlight the text to read)
