I know this is a touchy subject, and I’m really hoping that nobody get’s offended by this topic, but blood magic is a valid branch of magic that I practice and it has come to my attention that it’s really hard to find any good sources on blood magic. Keep in mind, I don’t claim to be any kind of authority, and this is all my personal practice. I’m more than willing to hear how others use blood magic, but please, NO SHAMING. If you don’t like blood magic, you’re free to state why, but avoid blanketed statements such as “it’s evil/wrong/sick/ect…” because, just because it’s not okay for you, doesn’t mean your morals and life experiences apply to everyone else.
First and foremost, in my experience and learnings, blood magic is not evil. It is powerful. Big difference. Blood has a lot of connotations and associations tied to it, so it packs a bit of a metaphysical punch when you add it to a spell. What you do with that punch is all on you.
Physically, it is you. Or who ever the blood is from. This means a couple things. One, it is a stand in, and possibly the strongest representation of a person in spell work. Now, because it IS a part of your body, your blood only represents you, possibly family with blood ties, your blood can’t be used to represent another person. Also, using your blood in a spell will permanently tie the spell to you. As far as I’ve noticed, it won’t ever lose it’s focus on the target who’s blood is included in the spell.
The other thing I’ve learned about blood magic, is that blood holds “a charge”, be it intent, energy, or whatever, almost indefinitely. This helps keep a spell from fading over time. This is good, and bad. If you want a spell to last essentially forever, then use blood. I’ve come across spellwork from my grandparents that had blood, and it STILL had a very strong and clear intent attached to it. This also means that you have to actively dispel the intent and break the spell if you ever change your mind or decide you’re done with it. How you break the spell varies, depending on the spell itself and your practice, but it’s got to be a good, strong, solid break to the spell.