I've finally taken the time to scour through what Pagan-related channels there are on YouTube, and I found one that reminded me of this thread.
Witch on the Rocks has a series of videos on "Dark Witchcraft." I don't quite agree with how she titles it, but basically she likes visiting cemeteries and such. Any of her videos that have "Dark Witchcraft" in the title you might want to take a peek at; don't know if they'll resonate with you or not, though.
What do you mean by cold-blooded? Do you mean an absence of empathy, guilt, and the like?
What do you mean by predatory? Would something like sport hunting appeal to you?
Regardless, it could be fun for you to look into various mythologies, both ancient and contemporary. I would suggest
God Checker as a starting point, because you will be able to do a search here for deities from the world's religions that deal with the subjects you are interested in (roll your mouse over "browse the pantheons" and the search option will be at the bottom of the list). It should only be a starting point, though, because they don't have a lot of information on their site. You can make a list of deities that pique your interest and dive into their mythology; maybe find some stories that speak to you.
Some other possible directions... it seems like some of the modern occult/paranormal literature might appeal to you as well. You might also research holy days related to revering ancestors. Halloween (Samhain) and Day of the Dead come to mind; there might be traditions in these you could use for a personal spiritual path. I know Eastern religions have a bunch of ancestor-related things also, but that's not my area of knowledge. There's also the possibility of connecting with some subculture groups, such as the gothic, vampires, perhaps otherkin.