This is the Xtreme version of that power and comes from my personal BOS, the power this gives is Xtreme and if you can't handle it, it can drive you a little nuts, and there is no reversing it once it starts. Blood magick in and of itself is dangerous enough, add Xtreme actions to it, and it becomes a force to be reconed with.
Here you can customize blood magic for DA or BA purposes, since it is done on YOU ONLY. I would not do BA unless you are prepared for it, especially since you are doing it to yourself. If you can think of it, and you had it in a past life or your current past, YOU ONLY it can be gotten back.
This will NOT bring back your ex, just because you had them in your past. That is another matter altogether and this spell will NOT accomplish that goal. But you must keep in mind this is dangerous.