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.
This one comes with a warning label.
This will give you the power of any demon in your bloodline, in your past or your bloodline's past so be aware of this beforehand, A demon will also come with this to help you handle the power. It does not matter what that power was/is it will give it to you weither you want it or not.
DO NOT do this unless you are an experienced BA companion.