[PvK]

What does Blood Vengeance do that is powerful???

Of course, not all level-9 blessing need to be equally powerful, just like none of the other effects of same levels of different paths are identical. You get a lot more with Blood-9 than just another blessing effect.

Blood-9 gets you a Strength +4 blessing, which is quite nice. It also gets you an enormous bonus when your pretender casts battlefield blood spells, which ordinarily cost 100 or more fatigue per casting, and at Blood-9 get very hard for the target to resist. There are also many blood-empowering items which can be stacked on top of that. Another example is Cross-breeding, which yields more results the better your blood skill is.

Now, on a fountain, that doesn't do you very much good, since you're stuck in one place, but a high blood level on your fountain, which already has a blood hunt bonus, means a very large increase in the blood slaves gathered each hunt.

PvK