This spell is nothing to play with, it works very well and you will tie yourself to the spell forever using blood magick. Blood, once spilled, cant be unspilled. A revenge spell is powerful. Coupled with blood magick, it's practically unstoppable. If you are female, menstrual blood is the most powerful form of blood magick, for a man, a prick of the finger will do the trick.
Men can use semen and it will be almost as powerful as menstrual blood. If you have someone you truly want revenge on and you hate them bad enough, this spell will do the trick. It is powerful anyway, and mixed with blood, it makes it an unbeatable combination.
I must warn you though, this is very dangerous and you won't be able to stop it once it's started, just try to do damage control if you change your mind.
