Best Blood Artifacts?

[Xietor]

Assume the rule is in place where you cannot just retreat out of the battle immediately. So whoever is carrying the artifact will be at risk as well for at least 5 rounds of combat.

I typically stick to the "safe" blood artifacts, like the scepter of corruption, and the b1 boosters. But i confess blood magic is not my area of expertise. Can one make a case for any of the dangerous blood artifacts(constr 8) as being worth the cost and risk?

And remember, if you forge one, you could have summoned demon knights etc. So there is an opportunity cost as well.