What are the supernatural elements in Christabel?

There are quite a few supernatural elements however it does seem that we know that there is evil lurking its just very hard to define.

Though we do get elements from the very beginning "Tis the middle of night by the castle clock,/ And the owls have awaken'd the crowing cock;" This has ominous tones and the idea of midnight, the owl and the cock are all supersticious symbols which give a uneasy feel to the audience. On top of that the reaction of Christabel to this uneasiness makes the audience more uneasy "Hush, beating heart of Christabel!/Jesu Maria, shield her well" and it is very surprising to find Geraldine, the "bright damsel...dressed in a silken white robe" instead of an evil monster. There are a few more things that i can mention too:

• The reaction of the Mastiff dog in her sleep ->knows there is something evil there
• Dying flames bursting to life as Geraldine passes them
• Serpent eyes and hissing
• The idea of Christabel's mother as a guardian watching her