Horror Fiction Help XIV

Here are some recent emails I've received from horror fans trying to find forgotten books! Any help much appreciated...

1. A vet gets involved with a black magic group including a man tattooed with the tree of life. UK paperback cover pictured the tattoo.

2. A man imports a hyena for his sick son which escapes and causes havoc in the city....I thought this was Graham Masterton but it does not fit any of his titles. Found!

3. A man who has grown up with magic and becomes of high flyer in a secret society... early on I remember that he goes to Sweden? for a meeting and takes a sauna, later he takes over the former mistress of another cultist.

4. 1970s novel (sci-fi/horror) has to do with some space arachnid. Cover shows a window washer (high up on a skyscraper) coming face to face with some sort of alien spider humanoid thing (presumably from outer space). I'm guessing it's from the late 60s or early 70s, because of when I read it and the sexual content (I got it out of our local library when I was a kid). Found!

5. It was 'satanic horror' but pretty mild. As best I can recall the main protagonist was a man who fell in love with a young woman with a mysterious past. There some lingering threat... something to do with her father and the place she'd grown up. The only solid memory I have is that there is a trunk that holds some key to the mysteries of the past. It isn't until the end of the book that the protagonist manages to open it and know the contents. They reveal that the father and daughter had had an incestuous relationship and that they'd worshiped Satan/devils/demons.  At the end of the book the girl has gone missing, as completion of some pact the father had made (I think). Found!

6. I never read the stories but heard them from a kid in my class at school way back around 1979, so don't know if they are from magazines, pulp comics or just urban legends/folklore.  

The first story may be called 'Night of the Black Weasel' or 'Black Night of the Weasel'. It's about a hiker travelling on foot along an isolated forest road who meets a traveller along the route. The hiker is alarmed to see the traveler has jet black eyes and weasel like features. My memory of what happens next is a little fuzzy but I think it culminates in a chase or fight, resulting in the hiker being decapitated by the demon traveler with an axe or hatchet. The missing hiker's head is eventually found with the hatchet/axe embedded in it and on closer scrutiny the words "beware the night of the black weasel" are found engraved on the blade. Does this ring any bells?  

The second story is set in an amusement park or carnival. A series of gruesome murders takes place inside a dark ride ghost train. Someone or something is beheading the passengers! When the ride is investigated nothing can be found to suggest what could have caused the deaths. Eventually it transpires a deranged circus trapeze artist has been hanging upside down from the rafters of the dark ride interior and dispatching the riders with a sword as their train passes underneath.
8. Trying to remember the author and title of a story I read in the late 70s which still has the best opening line of any short story I have ever encountered: "When Deidra came out of her grave, it was raining outside." Sound familiar to anyone? Its about a teeny-bopper ghoul.