From publisher blurb:
This book presents a slightly different view of the setting, placing a strong emphasis on psychological horror, with a supernatural bent. Stories using this book do not occur within the core setting of the Chronicles of Darkness, but instead inside a mirror universe defined by the sins and shortcomings of the unfortunate souls who are transported there.
This setting shard gives the Storyteller tools to craft a customized psychological horror experience tailored to the player’s characters.
Due to the intense and disturbing subject matter explored in Gabriel’s Horn, reader discretion is advised.
Gabriel’s Horn contains:
Alternate Character Creation guidelines
Two alternate Conditions
Two new Tilts
Alternate systems for Ghosts and Spirits
Five new Ghosts
Seven new Spirits
Two new Numina
Safety suggestions for running games involving psychological horror