Darkness Eternal quest has bugs:
- It does not end until Vicente Valtieri is dead. By this time, it is possible that the player character is already cured (or is doing Vampire Cure quest) and "further information on vampirism" is not relevant anymore. I think the quest should end when either becoming a vampire, or asking about the cure, starting Vampire Cure quest.
- It can appear when talking to Vicente Valtieri after becoming a vampire by other means.
- A player can get cured from Porphyric Hemophilia obtained from this quest. What should happen next? Should Vicente Valtieri give the player another chance? Should the quest be considered failed/done and be removed from journal? Currently it just remains in journal with no changes, and no second chance.