Infernal Breath Quest
I got all the items on the shelf/altar in Peklo, which I assume included the Infernal Breath spell book for Sphinx. Since I no longer have the spell book, I must have sold it. I thought perhaps the shelf/altar would reset after seven days, so I slept at an inn for eight, but no luck. The monsters in Peklo all respawned, so I know I waited long enough. Is there any way to complete this quest?