I have also tried another way. When I first meet Isbeil and Queen Justinia, if I don't get close to them right away, there is no transfer to the pit yet. I teleported one guard next to the other, the fight started. I killed everyone, including Isbeil and Queen Justinia. I poured the fog of death into the sea, circled and read all the notes there, completed the quest of the "Missing Masters" (I saw their ghosts), but the personal quest of the Beast remained unfulfilled and opposite it there was a flag in the quest log, a flag pointing to the corpse of Justinia.
