*take a deep breath, as if I'm about to deliver bad news*
If you go to the museum, you'll find a hundred year old photo of the city hall, decorated with a gargoyle. The gargoyle isn't there anymore and... and it wasn't a gargoyle. It... it was a bat demon, killed by... by witches with light magic. These witches pretended to be good, ut the bat demon saw through them and they... they killed her...
Her spirit was trapped but I was somehow able to free her spirit.