An example of this power in use would be the Blood inside the Key in the Tales from the Crypt: Demon Knight, the first movie in the series. And in my opinion, the only one worth mentioning. The Key held the blood of the wielder, as well as a bit of blood from all the previous wielders, all the way back to the Crucifixion, where someone filled it up with the blood of Christ.
This movie is a Great Resource for Dresden files, if you can find it.