Should I buy IL if I hate supernatural stuff?

I hate supernatural stuff, but I didn't mind the mermaids. They are more low-key than vampires, in my opinion. I wouldn't say it interferes with realism much because they aren't always in there mermaid forms, unless they are swimming, so you won't really see mermaids all that often.

Overall, I would say they are pretty avoidable and I would still purchase the pack.