Interesting DoD but what you describe is not Blood Magic , oh you may cause a minute ripple in the Aether but no more then that . I have preform Blood Magic and paid the price . You may have studied for years but I have been practising it for decades . I lived through mind and I have seen one other that did not . It's not a ritual it's a ceremony and if you don't do it right ( speed = death ) every little step your a goner and it is a very hideous and long death .
Oh and the virgin blood thing is wrong .